The 7 members with different looks, personalities and skills have gathered to achieve one dream of becoming a girl group to rewrite their forgotten dreams. Sister’s Slam Dunk Season 2!

Girl group project division conference! Vocal trainer, Jang Jinyoung! Who will be placed first in vocal test out of all the members? Dance major team vs. minor team's one point lesson! Then they all head to their accomodation where they will be living together until they become a girl group!

First night at their accommodation! Somi's teen love story is revealed during the members deciding on rooms and rules! The members bare face with no makeup and weight is revealed! For homework given by the dance teachers, the practice continues until late in the night. the Result is?

Han Chaeyoung's another try at making midnight snack! All the rising girl-groups are doing a personality test, what would the Unnies' members' personality be like? The new song with members' self-written lyrics is revealed at last!

First private vocal training! Somi fell in love with the vocal trainer, what has happened during the lesson? Yewon's house is revealed! From house-warming food, pajama party to Yewon and Somi's birthday party. What is the news that shocked every member of the Unnies?

The sad stories behind all the member's success are revealed. The reason why Jinyoung's green room became flooded with tears is? The new and an added song is finally revealed. How will the members react?

1 vs. 1 speed lesson with vocal trainer, Jang Jinyoung. He picks and solves all the members problem at once! Hong Jinkyung becomes the dance centre from being in last place! The choreographers only had one week to choreograph and the dance is finally revealed! The dance ranking over turns, who became the first and the last place?

Verse 2 specialty, Kim Sook. Will she be able to sing in the first verse? The part division war begins! Who will take the part of "I feel like a fish in water?" Mr. Serious, Jang Jinyoung's dance is revealed! A meeting about the concept for the girl group outfit. What will the final concept for the Unnies?

They practise their dancing until late at night! The full choreography for the song is finally revealed! The Unnies will be performing on the stage for the 300th episode special on "Immortal Songs!" The members attempt at rapping with Killagramz!

Unnies are performing on the "Immortal Songs'" 300th episode! One on one lesson with Director Han Wonjong. The recording finally begins.

The members try on the girl group stage clothings and also reveal their own stage outfit! The sudden change in the singing parts. The recording session finally completes!

The members go to Busan trip by train! From restaurant tour to filming their own music video. They show all their cuteness and talent just for spicy rice cake! For their music video, the Unnies cast special guests on spot at the beach!

Unnies' "Right?" is revealed. They dance endlessly for the music video shoot! The Unnies also act with chameos for the storyline for the music video. They film individual scenes and then moves onto the KBS studio for the last dancing shoot. The whole music video and the song is revealed!

Unnies finally perform on "Music Bank!" What happens afterwards? Never ending tears in every scene. Jinkyung says, "What's wrong with me? I must have "Music Bank" disease or something." Everyone is so tense before performing on "Music Bank."

As promised, the Unnies perform "Right?" dance on the bridges during the commuting hour for getting 1st on music charts. Their last performance at Konkuk University festival! The Unnies give a lecture and have a talk concert with the students.