Responses
I've been thinking about this for a while! I'm surprised there's someone with the same theory. Suhee's (Sanghee) murderer is still a mystery and it would make sense if Chris was the killer. First of all, Jinsu had his memories intact because of her strong connection to Sanghee and some other reasons which haven't been revealed yet. So, maybe Chris was the reincarnation of the murderer and he also had his memories intact because of her connection to Sanghee. IT'S SO PLAUSIBLE THAT I CAN'T HELP BUT ASSUME.
Here's a theory that I have. What if Chris is the reincarnation of the man that killed the main character in her previous life. It would make sense because sometimes Chris seems to have this dark side of him and he just seems off. Maybe that's also why he clings to the main character as well and tells her he loves her even though she has someone else.