행복은 성적순이 아니잖아요

Lee Mi-yeon

Lee Eun-joo

Kim Bo-sung

Kim Bong-koo

김민종

Son Chang-soo

이덕화

Park Gil-ho

최주봉

Homeroom Teacher

김일우

Mr. Jung

양택조

Lee Jung-suk

Choi Soo-hoon

Ahn Chun-jae

Choi Soo-ji

Ms. Kang

전운

Principal

정혜선

Eun-joo's mother

이해룡

Eun-joo's father

Hwang Byung-hoon

Kang Moon-do

김의상

Na Chok-sae

Lee Mi-nam

Lee So-young

김지영

Chang-soo's mother