It seems (to me) that all the of them knew each other when they were young. It's just that Jooin doesn't remember.
I agree, he might've got a form of amnesia or something...just a theory because I find it odd for him to forget his childhood friend so easily? I just wonder if he did get amnesia -what from...
maybe from a car crash or something? it seems Yawhi lost his parents so that might be related or
Jooin has some severe trauma that caused him to forget everything
Yeah...possibly
It’s obvious that Yahwi knows him, and it kinda seems like Cain does too...