Mun Ka-young

Lim Ju-kyung

Cha Eun-woo

Lee Su-ho

Hwang In-yeop

Han Seo-jun

Park You-na

Kang Soo-jin

Lim Se-mi

Lim Hee-kyung

Park Ho-san

Lim Jae-pil

Jang Hye-jin

Hong Hyun-suk

Oh Eui-sik

Han Joon-woo

Kim Min-ki

Lim Ju-young

Kang Min-ah

Choi Soo-a

Lee Woo-je

Kim Cho-rong

Yoon Seo-ah

Young Im Hee-kyung

Jeon Hye-won

Park Sae-mi

Yeo Joo-ha

Han Go-woon

Lee Il-jun

Yoo Tae-hoon

Lee Joo-ahn

Choi Man-shik

Lee Sang-jin

Ahn Hyun-gyu

Kim Hyun-Ji

Kim Si-hyun

Han Yi Young

Ha Ji-young

Jung Jun-ho

Lee Joo-hun

Kim Jung-hak

Mr. Oh

Seo Hye-won

Se-mi's Friend

Kim Ryul-Ha

Kim Ga-young

Oh Yu-jin

Joo Hye-min

Lim Hyun-sung

Comic Store Owner

Ahn So-rim

Lee Ye-rim

Ahn Sang-woo

Disciplinary Teacher

Kim Beong-choun

Vice-principal

Koh Woo-ri

Selena Lee

Park Sung-jin

Yoo Gang-hyeon

Kim So-bin

Classmate

Oh Chae-eun

Woo-hyeon's Girlfriend

Park Hyun Jung

Lee Mi-hyang (Seo-jun's Mother)