An Ethics Lesson

Lee Je-hoon

Jung-hoon

Cho Jin-woong

Park Myung-rok

Kim Tae-hun

Han Hyun-soo

Kwak Do-won

Soo-taek

Moon So-ri

Sun-hwa

Ko Sung-hee

Jin-ah

Lee Na-ra

Eun-yeong

Kyul Hwi

Min-tae

Park Byung-eun

Ji-hoon

Lee Seung-joon

D.A. Investigator

Choi Gwang-il

Attorney Choi

Lee Dong-ha

Prosecutor Lim

Kim Ki-cheon

Jae-man

Min Bok-gi

GG CEO

Park Gil-su

Boss of Electronics Store

Jin Yong-uk

Detective Moon

Chae Dong-hyeon

Police Officer

Kwak Jin-mu

Police (uncredited)

Kim Jae-young

Military Sibling