As Pink dates Q, a man whom she met on a dating app "Blind Date", never know that things around her are turning into a nightmare.

After having sex with Q, Pink finds reeking fluid discharging from her body. Pink finds out that she is infected with Q's strange disease. As Pink encounters strange incidents, she knows that this is not a human baby.

Pink wakes up in the hospital and realizes that the baby in her womb has grown a lot, although it has been only one day. Pink wants to have an abortion badly and she asks Por for help. At the same time, Por begins to believe that strange things are happening to Pink and she's not mentally ill. Por starts to investigate Q, who's involved in the beginning of the entire incident

Lada, gets hired to take care of the bedridden patient, Her Serene Highness Srisaang. The worst part of the job is, she needs to endure her patient's arrogant and despicable behavior.

Lada finds out a secret that makes Her Serene Highness look younger; however, everything's too late for Lada and her mother.

Lada calls her boyfriend, Q, and asks him to come over. However, she does not realize that this is part of Her Highness's plan to complete the requiem.

Off's live stream has caused the death of a mother and her daughter. His reputation is ruined as well. He ask his friend, Boat, together they create a channel called "After Dark".

Off and Boat, explore an abandoned four-story building. Off realizes that there is something even scarier.

Off and Boat have decided to go to an abandoned asylum. As the darkest secret of the asylum reveals, they encounter an accident that has never happened to any show before.

Chai, a handsome man, and his friend Om were taking videos secretly and sell the video clips via an "Open Chat" software called "XTH Room". As both encounter a new victim, nothing will be the same.

Chai begins to develop a strange relationship with the mysterious woman, which later forces him to choose between friend or love.

After an exploration in "Katkasu" everyone realizes that the real intention for "After Dark" is not about finding the truth. The revelation unveils when they meet Dao, who holds the key that leads everyone towards an unexpected conclusion of the story.