Ari, San, and the Reaper

When executioner and champion of the people, Master Yu, goes missing, Ari, San, and Reaper set out to find him, each for different reasons. San, the dokebi and Master Yu's biggest fanboy, looks to him for guidance. Ari, a mysterious child that can't speak, seeks revenge. And Reaper is on a mission to collect the Master's soul before it expires and they all face greater consequences. Source: Webtoon