Pemeran One: High School Heroes

Lee Jung Ha (이정하)

as Kim Ui Gyeom

Pemeran Utama

Kim Do Wan (김도완)

as Kang Yun Gi

Pemeran Utama

Im Sung Kyun

as Kim Seung Jun [Student]

Pemeran Pembantu

Lim Hyun Tae

as Choi Hong Il [Student]

Pemeran Pembantu

Lee Seung Heon

as Lee Jin U [Student]

Pemeran Pembantu

Lee Se Ho

as Choi Ji Hyeok [Student]

Pemeran Pembantu

Shin Jun Seop

as Nam Seung Sik [Student]

Pemeran Pembantu

Lee Chan Hyeong

as Seong Uk [Student]

Pemeran Pembantu

Hong Min Gi

as Kim Nam Hyeop [Student]

Pemeran Pembantu

Yuk Jun Seo

as Lee Gwi Jae

Pemeran Pembantu

Yoo Hee Je

as Choi Gi Su

Pemeran Pembantu

Shin Jae Hwi

as Gi Yun

Pemeran Pembantu

Bae Gi Beom

as Tailor Moon (Ep. 3)

Bintang Tamu

Kim Dong Hyun

as Dr. Kim (Ep. 4)

Bintang Tamu

Ko Kyoung Hee

as [Psychiatrist] (Ep. 4)

Bintang Tamu

Park Hui Sun

as [Center director] (Ep. 4)

Bintang Tamu

Seo Jang Hyun

as [Bullied middle schooler] (Ep. 5)

Bintang Tamu

Jung Se Hoon

as [Bully middle schooler] (Ep. 5)

Bintang Tamu

Kim Tae Eon

as [Subway student] (Ep. 6)

Bintang Tamu

Kim Sung Oh

as [Mumyeong High dean] (Ep. 8)

Bintang Tamu

Kang Joon Gyu

as Min Seop

Bintang Tamu

Yoon Hyun Soo

as Lee Ji Seong

Bintang Tamu

Kwak Hee Joo

as Choi Jeong Won

Bintang Tamu

Park Geon Ju

as Kwon Gu Hyeon [Student]

Bintang Tamu

Jung Dong Hoon

as Pi Do Il

Bintang Tamu

Ko Deok Won

as [Gi Su’s group]

Bintang Tamu

Park Sang Eun

as [Seung Sik’s group]

Bintang Tamu

Seo Joon Hyung

as [Seung Sik’s group]

Bintang Tamu

Park Kyung Chan

as [Teacher]

Bintang Tamu

Min Chae Min

as [Institute teacher]

Bintang Tamu

Kim Won Shik

as [Homeroom teacher]

Bintang Tamu

Lee Sung Tae

Sutradara