They Don't Kiss Until Episode 16

I’ve come here to tell you that Ji Sang Woo, this guy, is the original Paik Sa-on and is the baby serial killer.

1. He knows what the signet ring looks like that Grandpa Paik wore when he was drowning his grandchild, baby serial killer Paik Sa-on. Why would he see the ring? why?
2. The one we think is the serial killer has heterochromia. But there was a trusty security guard (it’s always the help) who told Hee-joo, hey girl, Sa-on had heterochromia when he was little but had surgery to fix it. So by that statement, the one people think is the original son can’t be (let’s suspend reality to believe that that contact lens is his eye).
3. He knows way too many details about the three kids who went missing. And even if he was friends with them, he wouldn’t know the details. But you know who would…a serial killer. Serial killers always keep the paraphernalia of their victims and form a sort of parasocial relationship with them. There is no way, that a fellow orphan friend would remember all those details and he only seems to know the details of those three/four. No one else.
4. Finally, he is just too calm. He keeps his cool compared to the guy we all assume is the killer. The assumed original Paik Sa-on is crazy for sure, but not serial killer crazy. And he isn’t that bright. Think about it, Hee-joo has been able to outsmart him three times and escape capture.

I am not sure what Sang-woo’s long game is, but I am sure he is the original Paik Sa-on. Let me know what you think.