No please he can't die.
His such a good character, who will Hayan have to talk to if he actually dies for real?? The series wouldn't be the same. It would be way too empty if it's just Hayan going after Yohan with no one to help her....
Going to break my heart if he does end up dying for real.
EDIT: I went back and re-read the prologue OH NO THIS LOOKS BAD GUYS