When bad guys do bad things, nothing happens to them. But when good guy did something bad to revenge, some expert detective or whatever appeared to find out who did these things. 
Comment by (´ ∀ ` *) on The Beast Must Die - Chapter 42
2 Replies
bad guys who do bad things regularly know how to cover their tracks 
@(´ ∀ ` *) too early to said if Kang moo will face his consequences or not, plus Kirin wasn't 100% innocent too