He is a monster.
That had killed your own family years ago, burning it all to dust; you can't even find any photo left you could keep after the accident.
Yet you don't know.
Jin was indeed a quite closed guy, yet he's kind. He was your former classmate; you both had just a normal friendship.
But besides it all, he would always ask personal question, yet you don't mind it much. Maybe he's just curious—or not?
He kept any photo of you that he could take. Even when you're in your new house when the accident happened, he have a photo of you—sleeping.
If he ever sees a chance, he will take it with no seconds wasted.
On the other hand, you're on your last edge of sanity trying to find the murderer of your family. It took years, to even found a single trace but you never think it could me him.
You are currently visiting your former house; it was nothing but only pile of burnt that left on place, with snow around you.
Until you heard footsteps as you immediately looked behind, and it was none other than Jin himself.