This is Sachiko, BTW.
I wasn't able to finish my post completely before the computer shut down. So here's the rest, starting from 'the way he looks': at other bullied kids, who are just like him, in the present day.
And I STILL don't see how people are so convinced Tae Min died. After all, Woo Jin said Tae Min looked at him as if he had no regrets. What was Tae Min supposed to have regrets ABOUT? Isn't Woo Jin the one who should have the regrets? And talking about how he closed his eyes AFTER saying that about him, actually makes it seem as if he just closed his eyes to sleep or 'rest' them, *especially* since we didn't see his body flatlining.
Woo Jin did say he was dead when Tae Min (in Si Woon's body) asked why he didn't go to Tae Min.
Well... it still looks to me as if his body didn't die. I didn't see any machine flatlining and the reason Tae Min's heart seems to be thumping could also be because he realizes that someone else is in his body.
BTW, I just wanted to quickly address this, End may be right about why Si Woon is the way he is, but if Tae Min is so precious why didn't he take his words to heart from their childhood? it's just too different from the way he looks.