Yacha

Ten years ago, the protagonist, Kang-min, lost his older brother, who was like a father to him, in a coup d'état orchestrated by the Haegang faction. Furious, Kang-min is arrested while trying to punish the traitors and sentenced to life imprisonment. Kang-min is released after ten years on a suspended sentence by the police, who are trying to rein in the out-of-control Haegang faction. The bloody revenge of Kang-min, the yaksha of hell, begins!

(Source: Naver, translated)