Responses
Didn't the author already show why to some extent? Jae Yeol first took notice in Hyung Suk when he told boxer boy not to talk bad about someone's mother. Given everything else Jae Yeol seemed to ignore, this indicated to me that he has a big soft spot for family.
if you quit smoking you will get a lover... jaeyeol : *dropped the cigar* .. dammit dammit dammit my heart