The Merciless
불한당: 나쁜 놈들의 세상 (original)
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 release, their ulterior motives starts to emerge.
Starring Sol Kyung-gu, Yim Si-wan, Kim Hee-won, Jeon Hye-jin, Lee Kyung-young, Moon Ji-yoon, Jang In-sub, Kim Ji-hoon, Kim Sung-oh, Jin Sun-kyu
It's a action & adventure and crime movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.