I think I know why Sungyeon turned into psycho-like character in the main timeline. If base on the main, side and special chapters, its look likes only Sungyeon has the memories of their past lives. But Hosik didnt have any. It's sad and painful for him because the longing he felt has been passed over for who know how many reincarnations. I'm not justifying all his psychotic acts in the main timeline, but the author really has a good story to build up all the feeling that Sungyeon has for Hosik.
I think I know why Sungyeon turned into psycho-like character in the main timeline. If base on the main, side and special chapters, its look likes only Sungyeon has the memories of their past lives. But Hosik didnt have any. It's sad and painful for him because the longing he felt has been passed over for who know how many reincarnations. I'm not justifying all his psychotic acts in the main timeline, but the author really has a good story to build up all the feeling that Sungyeon has for Hosik.