Han Bo-ram, 17 years old, first year at Iljin High School
Han Ji-woo, 28 years old, Boram's older sister
Kim Jong-ho, 28, ranked first in the fight between Jiwoo and his boyfriend
Byun Baek-hyun, 28 years old, Ji-woo's boyfriend
Do Kyung-soo, 28 years old, Ji-woo's boyfriend
Im Yoon-ah, 28 years old, Ji-woo's friend
Lee Seok-min, 28 years old, Ji-woo's boyfriend
And the 20-year-old graduates
Cha Bo-min is now 20 years old
Kim Jong-in, 20 years old
Kim Taehyung, 20 years old
Bae Jin-young, 20 years old
Lee Chan-hee, 20 years old.
20-year-old Rowoon
20-year-old Oh Se-hoon
And 19 years old
Choi San, 19 years old
Song Min-ki, 19 years old
Lee Jun-young, 19 years old
Joy, 19 years old