Characters played by Yoo Seung-ho
Kang Bok Soo
Characters played by Jo Bo-ah
Son Soo Jung
Characters played by Kwak Dong-yeon
Oh Se Ho [School's chairman]
Characters played by Kim Mi-Kyung
Lee Jung Sun [Bok Soo's mother]
Characters played by Ho-jin Chun
Park Dong Jun [Teacher]
Characters played by Kim Dong-young
Lee Kyung Hyun [Bok Soo's friend]
Characters played by Park Ah-In
Yang Min Ji
Characters played by Eom Hyo-Seob
Kim Kwi Chang [Principal]
Characters played by Kim Kwang-gyu
Song Yoo Taek [Vice Principal]
Characters played by Dong-Joo Jang
Lee Chae-min
Characters played by Joel Roberts
Shim-Ran
Characters played by Young-Sun Kim
Young-Min's mother
Characters played by Seon-ho Yoo
Yoo Shi-on
Characters played by Joon-seok Yeon
Oh Young-min