I am so into this mystery, y'all. I really want to know more about Sung-mo's past. It feels like everyone else's past is pretty much revealed already, but Sung-mo is the real mystery. I also wonder if this woman they are trying to find is Sung-mo's mother? All the women look similar and I think they all look like Sung-mo's mother. So was she taking the identity of these women and the mystery man was murdering them all? Or is she the actual murderer? I'm intrigued.