Volcano High

Jang Hyuk

Kim Kyung-soo

Shin Min-a

Yoo Chae-yi

Kim Hyeong-jong

Shimma

Byun Hee-bong

Jang Hak-sa

Huh Joon-ho

Mr. Ma

Gong Hyo-jin

So Yo-seon

Kim Soo-ro

Jang Ryang

Kwon Sang-woo

Song Hak-rim

Cho Seong-ha

Korean Language Teacher

Seo Beom-sik

Athletics

Jung Sang-hoon

Con Cho

Yun Mun-sik

Principal

Lee Yu-mi

Kyung-soo's sister

Park Dong-bin

Music teacher

Shin Cheol-jin

Chinese teacher