Han Suk-kyu
Teacher Kim / Bu Yong-ju

Ahn Hyo-seop
Seo U-jin

Lee Sung-kyoung
Cha Eun-jae

Kim Ju-hun
Park Min-guk

Shin Dong-wook
Bae Mun-jeong

So Joo-yeon
Yoon A-reum

Yoon Na-moo
Jeong In-su

Jin Kyung
Oh Myeong-sim

Im Won-hee
Jang Gi-tae

Byun Woo-min
Nam Do-il

Kim Min-jae
Park Eun-tak

Lee Kyu-ho
Mr. Gu Hwang-u

Jeong Ji-an
Uhm Hyeon-jeong

Ko Sang-ho
Yang Ho-jun

Yoon Bo-ra
Ju Young-mi

Lee Kyung-young
Cha Jin-man

Lee Sin-young
Jang Dong-hwa

Kim Yong-jin
Chief Lee

Lee Hong-nae
Lee Seon-ung

Park Jin-ah
Hyeon Ji-hyeong

Lee Ji-ha
Eun-jae's mother

Seo Dong-won

Sung Ryung

Jeong Han-seol
Seong Yun