FAI testifies against WING who smuggled cigarette. Therefore, FAI is set free. He then escapes away to Canada. The cops question WING. PING becomes the scapegoat for WING's sake. WING is bailed out with two million dollars. WING is eventually set free. He is not bound by law. PING and his family members are murdered. They suspect WING. KWAI orders CHUNG to escort F AI back to Hong Kong from Canada. CHUNG takes this chance for honeymoon with his wife, LIN. WAI welcomes CHUNG at the airport. LIN flies to New York for business. WING sends SZE and A to kill FAI. CHUNG shoots SZE. CHUNG then handcuffs FAI. CHUNG prepares to take F AI to the airport. Unexpectedly, A shoots F AI to death. CHUNG is shocked.

A site worker discovers a skull. The coroner proves that skull belonged to a middle-age woman. The police believes that WING is related. They then fax a photo with an eight years old girl to WAI for investigation. The F.B.I. complains CHUNG. CHUNG is forced to stop investigation. However, CHUNG ignores this order. He applies for annual leave and flies to Toronto. He continues to investigate. The reporter finds out that WING got married in 1978 with a woman named, NGOR. They have a daughter, PING, who is now eight years old. WING sends subordinate to assault the reporter. CHUNG meets PING and KEE. They are reluctant to reveal their identities. Meanwhile, A appears. A shoots PING to death. Soon the immigration department finds out that KEE is actually PING. PING is sent back to Hong Kong to testify at court. CHUNG stayed in Canada as his wife died in a car accident. He backs to Hong Kong after he finished her funeral rites.

They immediately send KEE to the police station to testify. The cop then sends her to the hotel. TAO and SUN accompany KEE to take some Japanese food. They meet WING. KEE claims that WING is the one who murdered her mother. WING knew that he was wrong. He leaves sadly. KEE is the witness at court. WING disappears. He takes the time to find an airplane to escape away. WAI (WING's current wife) goes to the police station and claims that her husband is being kidnapped. The kidnapper extorts one million from her. The next day WAI will flee to Taiwan with her son and lover. LUNG finds KAI in the open camp. KAI points out that KEE is not PING. KEE begs CHUNG to keep the secret so that she could testify against WING at court.

CHUNG is transferred to another unit. He orders MAN, MAK and CHI to follow BING. BING does not discover them. CHUNG wants to transfer his brother-in-law, KWONG, to his unit. He even asks KWONG to pass part of his salary to his father-in-law for family expenses. BING leads three more people to rob a jewellery shop. KWONG devises to scare BING away. CID brings KWONG back to the police station to investigate. CHUNG goes bail for KWONG. KWONG again follows BING. KWONG finds that there are posters and his photo on the wall. It is the loan-shark's good deed. KWONG tears off the posters but he lost BING's trace. Consequently, the CID gets nothing. BING escapes from the disaster.

KWAI got some information from CHUNG's unit. The CID goes to arrest CHIU. However, they are not succeeded. They only get CHIU's finger prints. FONG takes a group of Taiwan tourists to the nightclub. A rascal, KAP, stirs up trouble. FONG calls CHUNG for help. The cops arrive. KAP is very frightened. FONG thanks the cops by taking them to have Japanese food. Meanwhile, the rascals again bother FONG. CHUNG overwhelms them. The information centre reports that there is a robbery on the Jet Ferry incurred twenty million dollars. The police sends marine and air force to start a thorough search. However, there is no trace for the robbers. BING uses false name to book flight ticket in a travel agency. He plans to take the ticket at six o'clock. CHUNG asks FONG to delay him. Meanwhile, BING is shocked to find his file comes out from the fax machine.

CHUNG goes to the travel agency immediately. Unfortunately, BING was shot to death. BING is hurt. He escapes away. He crashes his head to a brick wall and dies. Four million paper notes spreads all over. The Mainland police force informs the Royal Hong Kong Police Force that the 'Three Flag Robbers' are being arrested and six million. Stolen money were found. KWAI found out that one of the robbers, TAT, has still not yet arrested. MAN asks BING's aunt to describe the robber's appearance. They recognize that this person is very similar to TAT. CHUNG remembers that he has seen TAT's picture in BING's file. The Macau police eventually confirms that TAT is the gang leader. They inform the Hong Kong Police to arrest TAT and sixty million stolen money was found.

ON is robbed by HO after drinking some Vitasoy milk with sedative. ON tries to drive to the police station despite the fact that he is very dizzy. It leads to a serious car accident. KWAI transfers HO to the Information Unit and CHUNG is transferred to the O Unit - A Unit Against Serious Crime and Triad Organization. CHUNG is the one who in charge of this case. He sends KWONG and MAN to oversee the suspects nearby the 24 hours stores. The suspect eventually appears. Unfortunately, MAN becomes the victim. The criminal makes use of her credit card to draw twenty-three thousand dollars cash. HO and BALL have already started to inject tranquilizer into lemon tea to commit crime. They find it more effective. WAI backs to Hong Kong. He joins the O Unit and is the chief inspector of the A Section. He immediately gathers all CID together at the police station and sets off to arrest the rascals.

BALL cautious HO to stop for a while. However, HO does not listen to his advice. He keeps on his illegal act. W AI orders the CID to cooperate with other units. They take turn to oversee the 24 hours store overnight. Unexpectedly, MAN neglects her duty. The cops could only take BALL and B's picture. The robbers flee away. HO's mistress, JADE, demands HO to give her family expenses. HO asks loan-shark to lend money to JADE. Meanwhile, JADE finds that HO is now wanted by the police in the TV news. His picture is shown in the news. JADE fears that HO will get her involved into trouble. She immediately leaves the house. HO chases after her with a pistol.

JADE asks a policeman for help. She claims that HO is threatening her with a pistol. WAI arranges CHUNG to put an overhearing detector in JADE's telephone. WAI also asks LUNG to protect JADE. HO again commits crime. He even robs the passengers and captures their cash and credit card. He robs a jewellery shop and gets a diamond ring. He intends to use this as a wedding ring for JADE. The police finds out that HO has deposited all his money into JADE's bank account from the CCTV system. JADE cooperates with the police in lest that she will get involved into trouble. The cop arranges JADE and RAY to appear. He hates JADE so much that he killed her. The police fires HO to death.

At night, WAH is being sent to the prison. It is because he fought against BILL who belonged to the SHUN LOK Triad. KWONG and MAN mingle into the fish market. They find SING extorted money from the fish seller. SING drives away all fish boats which do not have a 'HUNG' flag. They are not allowed to disembark in his area. KWAN punishes HUNG by chopping him off into pieces as he has betrayed WAH. He then throws his dead body pieces into the sea to feed the fish. TAI and his wife back to Hong Kong. The next day TAI reports duty to WAI. TAI and WAI are holding a wedding banquet in a Chinese restaurant. KWAN and his friends are also in the same restaurant. Meanwhile, BILL arrives with his subordinates to take revenge on KWAN. The cops devise to stop them from stirring up sedition.

BILL let KWAN go. The police charged BILL who possesses weapons and bought him to the police station for investigation. CHUNG arranges FONG to identify the criminal. FONG finds BILL very familiar. She has seen her in a Chinese Restaurant. WAI shows a smile of satisfaction. CHUNG finds out that KEUNG has hidden some heroine and FA becomes unconscious due to drug overdose with needle. WAI deliberately lets KEUNG go. CHUNG is very dissatisfied. He could only accept this after YEUNG explained to him the case. SING orders KEUNG to back to the office. SING intends to kill YEUNG. Fortunately, WAI saves KEUNG. KEUNG claims that he could keep in touch with the police by phone for twenty-four hours. KWAN sends killer to kill KEUNG and his family. KEUNG tries to flee to Macau but is in vain. In order to save his family, he commits suicide!

BILL's subordinates kidnaps FONG's colleague. They beat FONG's colleague terribly. FONG suspects that BILL intended to beat her as she had identified him at the police station. BILL is very aggressive. He bothers the fish market which is KWAN's area. SING wants to kill BILL. FUNG stops her. KWAN and BILL are arranged for a negotiation. However, BILL does not show up. BILL frames KWAN up by hiding some heroine in his place. The police brings KWAN to the police station. TAI takes KWAN's attestation. Heart attack again bothers KWAN. He is being sent to the hospital. SING and his subordinates fight against BILL. BILL is defeated. WAI convinces KWAN to stop SING and his subordinates !

CHUNG finds out that CHEONG is bleeding due to throat-cut. He brings YING to the police station for investigation. CHUNG takes attestation from YING. She admits that Rebecca had paged her to serve the customers. Meanwhile, YING's beeper is on. Rebecca again calls her to serve another customer at a hotel. Rebecca (Chinese name CHI) appears. YING chases CHI to the main entrance. The cops stop YING. However, CHI has already gone. CHUNG sees a bar-tender, S. They took a picture of CHI. CHUNG shows S the picture. S recognizes CHI. CHI holds a birthday party for MAN. CHI invites TAI to attend the celebration. CHI stupefies MAN with some sedative. TAI arrests CHI However, CHI's attestation proves that YING is not the one who killed CHEONG. It is because she is still in prison when CHEONG was murdered.

WAl sees the back of a short-hair man (STING) in the video-tape taped by the CCTV system of a 24 hours store at the murder spot. This man calls to the police station and leaves. YING is sentenced not guilty. Sand YING talk about CHUNG at the disco. YING calls CHUNG to drink with her. However, CHUNG does not show up. YING goes out for a ride with some customer. S disguises as CHUNG to page YING. S asks YING to see him in a hotel. YING leaves after she found out that he is S. CHUNG finds S's address which is same as WAI's finding. They find that the house is empty. They find that YING's pictures are post all over the wall. They know that the murderer admires YING a lot. The cops make use of YING to lure the murderer. However, the murderer does not show up. CHUNG sends YING home. Spires a knife into CHUNG's back. CHUNG fires S. S is shot to death. CHUNG is slightly injured!

Robbers, HOI, LI and NAM, are trying to rob the house of the Chief of the Police Force. The police pays special attention on this case. They try their very best to arrest these robbers. Three robbers with masks rob a rich merchant. Fortunately, security guard SUM, YIN and KWONG, join together to fight against them. The robbers are failed. They escape away. SUM finds that one of the robbers are with beard. The police finds three suspects through a spy, MING. However, they find that these suspects are not related to the 'Peak' case. The robbers intend to rob a luxurious apartment at the Peak. The victim, WENDY, loses some jewellery and fifty thousand dollars. WENDY is being kidnapped. The cops appears. WENDY claims that it was just a misunderstanding!

WENDY claims that nothing has happened. She requests to cancel all charges. At night, WENDY appears in a bowling centre. She fetches an envelop at a locker. SUM and YIN follow her. They bring her to the police station for an investigation. CHUNG opens the envelop. WENDY thinks that there are her nude photos. In fact, it is a pack of white sheets. All are shocked. HO extorts money from WENDY with the claim that he got her nude pictures when he was raping her. WENDY gives HOI the ransom when she received the negative and pictures from him. Meanwhile, CHUNG and the cops arrive. HO tries to flee away but he was knocked down by a car instead. The police finds LI and NAM's residential address. CHUNG and his team go to arrest them. It leads to gun-shooting. LI is fired to death. NAM falls down from a building when he is trying to flee away. He eventually died. The paper-notes spread all over!

The police suspects that the paper-notes is from LEE FU. CHUNG investigates FD and finds out that FD's daughter was kidnapped. FD had given the kidnapper ten million ransom. Nonetheless, the kidnapper still not let his daughter go. TAO is suspended from office as he beats HOI when he is asking HOI to give attestation. WAI devises to get more information from HOI's wife, PING. However, he still finds no clue. MAN follows PING home. She discovers that there is a lift which is out of service for about one year. She forgets to record this in her report. The police checks HOI's old file and finds out that HOI is very familiar in lift repairing and maintenance. CHUNG finds FD's daughter at the bottom of the lift according to MAN's report. TAO is demoted.

THOMAS and his other three friends cooperate in breaking in a jewellery shop to steal. They succeed. Nobody notice. MAN and TAO are in the same team. They hurry to the jewellery shop. However, it is the O Unit to in charge of this case. CHUNG finds out that Thomas group has robbed four jewellery shops. The loss is over four million. WAl orders CHUNG to clear the case as soon as possible. THOMAS injects some virus into the computer security system. It disconnects all hotline. SUM orders all security guards to petrol overnight. SUM oversees the shopping arcade. The pickpockets steal SUM's wallet. SUM is slightly injured. CHUNG goes to see movie with FONG. ON the way he meets an old friend, KI. BUN and KEUNG are forcing KI to sleep with him in a hotel. They also attempt to slap KI. CHUNG stops them.

KI feels ashamed of herself. She decides to cancel the charge against BUN. KWONG asks MAO, the one who bought the stolen goods. MAO is willing to cooperate with the police force. MAO informs the police that THOMAS who is now playing football with CHUNG is one of the robbers. CHUNG continues to play football with him. It seems that nothing had happened. THOMAS and his friends gave CHUNG their name cards before they leave. THOMAS heard the conversation between KW Al and CHUNG through the radio. They are shocked to be discovered by the police force. KI informs THOMAS that BUN is going to deliver some diamonds to Shanghai. THOMAS is very confidence in himself. CHUNG knew that THOMAS and his group have already disappeared. He knew that there is something wrong.

THOMAS and his group again rob a jewellery shop. Consequently, they got all diamond needed for Shanghai. THOMAS drives KI home. He asks her to meet at noon in the airport tomorrow. Meanwhile, BUN is looking at KI's building. THOMAS finds them very suspicious. They buyer sends expert to check the diamond.. They find that all diamond are faked one. THOMAS suspects KI and BUN. KI pays visit to her friend's tomb. CHUNG follows her. He attempts to arrest her. KI resists and captures his pistol. THOMAS appears. He drives KI to a remote area and fires her. KI is seriously hurt and is in coma. THOMAS and his friends enter the airport smoothly with false passports.

There is a big gun-fight between the police and the robbers. There are ten death and three injured. The major criminal, YAD, is wanted with a reward over five hundred thousand dollars. YAD orders FAT KEUNG and his friends from the mainland to rob again next week when their ammunitions arrive. WAI orders them to arrest YAD as soon as possible. Sir TSANG was killed by YAD. The next target should be WAI. It is because WAI had arrested YAD five years ago. YAD was sentenced to five years imprisonment. W Al invites TAI to have lunch. They get into the car. WAI finds a news clipping and a cassette tape on the wind-screen before they close the car-door. WAI puts the cassette tape into the hi-fi. In the tape, YAD claims that there is a bomb in his car.

The bomb experts finds that the bomb system set up is very complicated. It could not be disconnected. The police uses a crane to lift up the car and cover the ground with a big piece of cushion. W Al and TAI then jump down from the car. The bomb explodes after a second. WAI is all right and TAI is slightly injured. Sergeant delivers YAD's picture to all policemen. YIN found YAD who is nearby a jewellery shop. CHUNG and his team arrive. They suspect YAD who has disguised as a monk. They start a thorough research. YAD disguises as a police with uniform and leaves. MAN discovers him and fires him. MAN gives CHUNG some clue. CHUNG eventually finds out that YAD has made a false car plate 'CG1234' to commit crime. WAI hurries to the spot. WAI and YAD start a great gun fight. YAD eventually escapes away.

The police knew that YAD will arrange to leave Hong Kong. TAI and his team are arranged to oversee the airport. However, YAD losses his passport. TAI cannot see YAD. YEUNG knows that WAl is in a very dangerous position. He arranges WAI and his wife to stay in a hotel. There are even guards at the lobby and lifts. WAI takes a drink at the lobby. All cops move forward to protect him. YAD knew that he has no chance to kill WAl. He leaves the hotel. TAI accompanies WAI and MEI to FONG's travel agency to get the flight tickets. YAD shoots twice at the opposite building. Fortunately, WAI is all right as he has worn a bullet-resistant jacket. However, FONG is hurt due to an explosion at her travel agency. YAD has set a bomb at FONG's travel agency. YAD again attempts to shoot WAI. However, somebody shoots from behind. YAD is eventually shot to death.

WAI thanks TAO for his help. However, TAO does not accept him. FUI arranges YUK and CHEUNG to discuss about printing counterfeit paper-note. FUI and YUK oversee the printing of counterfeit one hundred paper-note in a chamber. FONG leaves the hospital. FONG heard that a customer, KEE, from Taiwan wants to match-make his younger brother, TE, to her. FONG eventually convinces KEE to allow TE to marry a foreigner. The counterfeit paper note circulates everywhere in town. YIN is one of the victims. He is arrested and is taking to the police station. He is suspended from office temporarily. T AO is transferred back to the 0 Unit Team A. They hear that FUI is attending a banquet held by a triad gang. CHUNG and his team go to arrest FUI at the Chinese restaurant. They are shocked to see FONG.

It is because KEE wants to thank FONG and invites her and her family to the banquet. TEDDY goes bail for FUI. TEDDY claims that he has already hidden the counterfeit paper note P.C.board in a safe place. The police cannot find the board. TEDDY asks FUI to make a copy P.C.board. FUI will start the printing after KEE went to Szechuen. CHUNG finds that TEDDY will have an illegal deal very soon. He leads his team to oversee TEDDY. CHUNG orders to search TEDDY's car. However, they could only find some pornographic magazines in his car. In fact, TEDDY has exchanged his car with the buyer. The buyer is satisfied to find that there is a heap of counterfeit five-hundred paper notes at his car.

The wanted criminal, THOMAS, points out that CHUNG had concealed KI's identity in WING's case. THOMAS could then escape from heavy punishment. CHUNG is then suspended from office temporarily. WAI sends KWONG to follow TEDDY. TEDDY asks his subordinates to teach KWONG a lesson. They even throw his pistol to the sea. MAN buys KWONG a toy pistol for disguise. KEE back to Hong Kong. He finds out that TEDDY and FUI by pass him and make counterfeit paper? note. He shoots FUI to death and forces FUI to swallow the counterfeit paper notes. TEDDY swears that he will take revenge. The police finds FUI's dead body . They suspect that it was done by the triad.

YIN and FU find a pair of arms with tattoo. They are shocked. CHUNG asks FONG about KEE who has just disappeared. TEDDY visits LING. Meanwhile, TAI and TAO arrive. They arrest TEDDY for an investigation. LING goes bail for TEDDY. The police finds a dead body pieces in a plastic bag. TEDDY proves that it was KEE's body. However, his legs and head are still missing. FONG receives some strange and unidentified object. WAI sends cops to protect FONG and his family. W AI heard that there is a great fight between the Taiwan and Hong Kong triad. He sends CHUNG to arrest them.

YIN and FU find a pair of arms with tattoo. They are shocked. CHUNG asks FONG about KEE who has just disappeared. TEDDY visits LING. Meanwhile, TAI and TAO arrive. They arrest TEDDY for an investigation. LING goes bail for TEDDY. The police finds a dead body pieces in a plastic bag. TEDDY proves that it was KEE's body. However, his legs and head are still missing. FONG receives some strange and unidentified object. WAI sends cops to protect FONG and his family. W AI heard that there is a great fight between the Taiwan and Hong Kong triad. He sends CHUNG to arrest them.

TEDDY fetches KEE's head from the refrigerator. Meanwhile, LING visits him. TEDDY is so scared that he drops KEE's head on the ground. LING is shocked. TE and FONG bury KEE's dead body in the cemetery. TE and FONG leave by taking a taxi after receiving KEE's bone ashes. Unexpectedly, TEDDY disguises as a taxi driver. He beats TB. FONG jumps out and shouts for help. The police finds a female dead body in the flower nursery. They heard that KEE is being attacked. They believe that TEDDY is related to this murder case. They eventually find out that it is FONG's dead body. The information department eventually locates TEDDY. WAI CHUNG and the team set off to arrest him .......