An inspector from the Educational Rights Protection Bureau (ERPB) who is authorized by the government to use physical intervention and unconventional methods to discipline delinquent students and reform the educational system.


Kim Moo-yul
Na Hwa-jin
Kim Moo-yul (born May 22, 1982) is a South Korean actor. Following a successful career in musical theatre, Kim was first cast in minor parts on film and television. After gaining recognition for his performance in War of the Arrows (2011), Kim landed his first major role in Jung Ji-woo's critically acclaimed film A Muse (2012). Kim went on to star in notable films Northern Limit Line (2015), Forgotten (2017), The Gangster, the Cop, the Devil (2019), Honest Candidate (2020), and The Roundup: Punishment (2024).

Lee Sung-min
Choi Kang-seok

Jin Ki-joo
Im Han-rim

Pyo Ji-hoon
Bong Geun-dae

Kim Jong-soo
Hwang Gi-tae

Ahn Ha-young
Choi Ga-yun

Lee Bong-joon
Cho Gyu-cheol