Buried anger? That's for amateurs. Baekhyun wears his like a crown.   They say anger's a driving force. Well, for him, it's a damn inferno.   He's hell-bent on making Mer regret every moment she spent without him, to make her taste the bitterness of throwing away what they had.   The man she walked out on? He's a shadow of his former self, twisted by resentment.   Four years of agony only sharpened his edge.   Lon