Name : Im Nayeon (19, female)

Status : High School Student, Second grade

- cheerful girl

- love jelly, sweets and Kyungwan so much

- Good in singing and Korean subject

- The oldest of two siblings

Name : Jeongyeon / Son Jeongyeon/ Yoo Jeongyeon (19, male)

Status : High School Student, Second grade

- Rebel kid, a player

- Love fights

- Bad in all subjects except math and sports

- Short temper

- Bad jokes, Nayeon hates it

- The youngest of the twins

Name : Yoo Kyungwan (19, male)

Status : High School Student, Third grade

- Smart

- Kind

- Bad jokes, but Nayeon loves it

- The oldest