Responses
No, I think they were the "naturally blessed" kind, with the most horrible personality. Their influence, tho, allowed the creation of that black room. Simplified: their natural evilness allowed the demons in Yeon-Woo and Taejun to wake up themselves. I think.
yeonwoo's parents had a black room with mirrors in their house, does that mean yeonwoo's parents were takers too?