Characters:

Jung Daehyun: 20 years old. Gives off a warm feeling, always smiling and helping others. TS trainee.

Kim Mary: 19 years old, sweet, nice, caring girl. A trainee under TS, to debut in a 5 memeber girl group.

Jo Jonghwan: 20 years old. Caring towards everyone, Mary's childhood friend.

Kim Youngjin: 5 years old, a sweet-heart. Mary's little brother.

OTHERS/CAMEOS:
 

Yongguk~

Himchan~

Youngjae~

Jongup~

Zelo~

Hyosung~

Jieun~

Zinger~

Sunhwa~

Members of TS new girl group, D. Diamonds (I don't know, I just made that name up):

Jihye- 20 years old, leader, main vocalist and rapper.

Hana-19 years old, Mary's best friend, lead vocalist.

EunMi- 17 years old, main rapper, sub-vocalist.

HyeMi- 16 years old, vocalist.