From my understanding yooyoung (black hair) and yooyeon (white hair) are twin bros. But since their mother died the father was hateful toward yooyeon because of his different appearance and from my guess was thought to be a curse which lead to them trying to kill him. Then yooyoung who was probably jealous or angry of the relationship between his bro and kwon cuz he didnt want his bro to have a shred of happiness got in the way between them? Which i am guessing caused the misunderstanding that kwon had feeling for yooyoung instead of yooyeon once he found out they were "married". And this can be backed up by the fact that present day yooyeon when confronted on who he was said that he was yooyoung and they lived a HAPPY married life together. Which from the flashbacks we know is not true. So once all three of them died yooyoung and kwon reincarnated while yooyeon from all his hatred and obsession on wanting to be loved by kwon turned into the curse/demon that he is today. There are many unknown variables but yooyeon is still in that mind set that kwon is in love with yooyoung when I honestly dont believe that is really true by how kwon was treated in his past life. And from the flashbacks i could tell kwon was more in love with yooyeon because of how worried he was and how much he thought about him. And i feel like kwon was trying to tell yooyeon that but the man is broken!!! (≧口≦)ノI mean yooyoung could have possibly turned over a new leaf in the present but the karma/curse was stacked against him which lead to his death. Also on a side note kwons dad can GET IT!! That man was fiiinee as hell!!! ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
From my understanding yooyoung (black hair) and yooyeon (white hair) are twin bros. But since their mother died the father was hateful toward yooyeon because of his different appearance and from my guess was thought to be a curse which lead to them trying to kill him. Then yooyoung who was probably jealous or angry of the relationship between his bro and kwon cuz he didnt want his bro to have a shred of happiness got in the way between them? Which i am guessing caused the misunderstanding that kwon had feeling for yooyoung instead of yooyeon once he found out they were "married". And this can be backed up by the fact that present day yooyeon when confronted on who he was said that he was yooyoung and they lived a HAPPY married life together. Which from the flashbacks we know is not true. So once all three of them died yooyoung and kwon reincarnated while yooyeon from all his hatred and obsession on wanting to be loved by kwon turned into the curse/demon that he is today. There are many unknown variables but yooyeon is still in that mind set that kwon is in love with yooyoung when I honestly dont believe that is really true by how kwon was treated in his past life. And from the flashbacks i could tell kwon was more in love with yooyeon because of how worried he was and how much he thought about him. And i feel like kwon was trying to tell yooyeon that but the man is broken!!! (≧口≦)ノI mean yooyoung could have possibly turned over a new leaf in the present but the karma/curse was stacked against him which lead to his death. Also on a side note kwons dad can GET IT!! That man was fiiinee as hell!!! ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄