The protagonist of the series is an anti-heroic character known as Munsu, a third mahai angyo onshi from Jushin's fallen kingdom. Despite the belief held by many former citizens of Jushin that angyo onshi are virtuous and upholders of justice, Munsu often comes across as somewhat amoral and does not believe in helping people who refuse to help themselves. When he does assist others, his methods typically involve excessive violence, lying, torture, and other questionable acts.