The Merciless (2017)

Cast: Sul Kyung-gu, Yim Si-wan, Kim Hie-won, Jeon Hye-jin, Lee Kyung-young, Moon Ji-yoon, Jang In-sub, Kim Ji-hoon, Kim Seung-o, Jin Sun-kyu

Jae-ho, who aims to become the number one in a crime organization, gets to build up trust with Hyun-su, an ambitious newbie in the prison. While they try to take over the organization after the prison…