Mercy for None Season 1

The story revolves around a man, Nam Ki Jun (So Ji Sub), who was a member of the Bon San gang. In brutal battles, Nam Ki Jun defeated other gangs, and the Bon San gang grew into a large company, but Nam Ki Jun decided to leave the gang. His younger brother, Nam Ki Sok (Lee Jun Hyuk), joined the Juun gang, which was rivaling the Bon San gang. Nam Ki Jun lives peacefully and earns a living by delivering drinks to businesses. His brother Nam Ki Sok becomes the second-in-command in the gang, but mysteriously falls into a trap and is cold-bloodedly killed. To uncover the mystery of Nam Ki Sok's death and to seek revenge on those responsible, Nam Ki Jun returns to the world of gangs after 11 years. Filled with icy rage, Ki Jun sets out on a solo hunt to track down all those involved in his brother's death.