YOYOUNG IS SO SUSPICIOUS IDK BCOS HE DID NOT SAY THAT HE'S YOYEON (FROM HIS MOUTH) maybe b...

No, I don’t think so. Remember that in his past life the one that had all the power and influence wad Yoyoung. Yoyeon would only come out to play at night since he was cast aside for whatever reason. So if you really think about it, Yoyoung could force Kwon to do whatever he wanted and no one would bat an eye, not even his younger brother. He was helpless in that situation. I think something happened where the younger brother messed up big time and in his twisted love ended up cursing Kwon and himself so that they would both end up together in every life.