행복은 성적순이 아니잖아요

Lee Mi-yeon

Lee Eun-joo

Kim Bo-sung

Kim Bong-koo

Kim Min-jong

Son Chang-soo

Lee Duck-hwa

Park Gil-ho

Choi Joo-bong

Homeroom Teacher

Kim Il-woo

Mr. Jung

Yang Taek-jo

Lee Jung-suk

Choi Soo-hoon

Ahn Chun-jae

Choi Soo-ji

Ms. Kang

Jun Woon

Principal

Jeong Hye-seon

Eun-joo's mother

Lee Hae-ryong

Eun-joo's father

Hwang Byung-hoon

Kang Moon-do

Kim Ui-sang

Na Chok-sae

Lee Mi-nam

Lee So-young