Pretty sure he was bullied when he was younger. The creepy dude he last fought was either one of the bullies or knew about it.
My take is that he fcks men to get relaxed and to remind himself of his strenght before his matches. But at the same time, seeing Kim Dan so stupid and resiliant annoyed the shit out of him. So he hates weak people because they remind him of his old self, but he also needs them to bully them and feel better.
Might not be that exacly, but that's what seems most logical to me
I hope Kim Dan stays gone and season 2 is just a continuation of JK’s downfall. Every month the pain in his heart cuts a little deeper each time Kim Dan sends a “penny” his way- and when those pennies feel like thousands of dollars and JK loses his sponsors, his fans and his career, maybe Kim Dan can come back (づ ̄ ³ ̄)づ
Bit I am wondering tho, what if jaekyoung has his jinx after a traumatic past or something? He uses poor men and fucks them to relax from his sorrows before every fight. Now that Kim Dan is gone he lost everything but he is too prideful to realize it, and I hope that he misses Dan deep in his heart