Spoiler!
I already read till Dooshik being caught by police, it's Pilwon trape. That sick demon making Daehwi and Daekwang (incest twins) into bait. And I think both of them were killed by Dooshik. Daekwang was raped by Dooshik's subordinates as Dooshik's revenge for the crimes Daekwang's brother (Daehwi) committed on Jooha.
"Wei-ying, come back go Gusu with me...!"
