Chou Tzuyu/ Zhiou Yixin - He is Sana's bestfriend. After her fight with Sana and Sana's boyfriend(Jimin). He will get into an accident. He will be the one who will have an Amnesia.

Minatozaki Sana - She is Tzuyu'z Bestfriend. At first she doesnt know the truth in relationship with her boyfriend that's why she fought with Tzuyu.

Myoui Mina - Mina has a traggic incident from the past. From then she become cold to everyone. But when it come to her friend and family she's so warm and caring. soon will becoming Tzuyu's girlfriend.

Chou Chaeyeong (Chayeong) - Brother of Tzuyu and Dahyun's Twin.

Chou Dahyun (Dahyun) - Tzuyu's Brother and Chae's Twin.

Hirai Momo - Mina's Bestfriend.

Im Nayeon and Yoo Jungyeon - Couple's and Mina's Friend.

Park Jihyo - Mina's friend, leader and the Mother like of their group of friends

Krystal Chou (Krystal) and Kai Chou (Kai) - Tzuyu, Dahyun and Chae's biological parent's.

Jessica Yixin (Jessica) and Lay Yixin (Lay) - will becoming Tzuyu's another parents. At first they don't have a child until Tzuyu came to their lives.

And there will be an upcoming some characters or maybe I will add some characters that they will encounter with their life. 

Additional Info's about their family background and the life they have in this story..........

Chou's Family - A family from Taiwan that transfer to Korea. Only have small business