Phase 1

Roommate Squad

Irene

Sana

Jihyo

Yeri

Winter

Cruz Family

Mr. Ian - father

Dr. Abigail - mother

Sana 

Sana's childhood friend

Mina

Joy's social circle/peers

Suzy 

Jennie

Nayeon

Mijoo

Yein

Mijoo

Sana's bestfriend

Rosé

Student council members:

President: Sana

Vice President: Karina

Secretary: Seola

I didn't try to make a pair to Joy coz if you understand her character she is aromantic.

Phase 2

After 5 years roommates squad dissolve after Sana graduated and will reunite at the storyline of Rosé and Suzy.

Sana meet her new friend Eunha.

Roommate squad new recruit members and generation after 2 members left.

Seola

Eunbi

Chuu

Shuhua

Nako

Wonyoung

I'm trying to think if I'll make a side story for the rest of roommate squad that will name as squad goals.

Roommate squad members was in the series of You Are, Am I.

Members without on that series but will have a story: 

Irene

Yeri

Jihyo

I'm thinking of Solar, Wonyoung, and Sejeong for the 3 members.