Story
Ryu Kangmin, a member of the massive assassin organization “Batala.” Once you enter this place, there is no way out. One day, however, he receives a special assignment with freedom as the reward. The mission: eliminate a target located in South Korea. In pursuit of his freedom, Ryu Kangmin returns to Korea and, as a warm-up, takes care of a traitor within the organization first. After finishing that light warm-up with ease, he finally begins the real mission...
Synopsis via AniList (English).