
I think the blonde haired guy fell for eun nanjo after seeing his affection towards that twink and how sweet he treats him and wanted to be treated/loved that way.
(hopping it's not just he wanted to experience how sex would feel with eun nanjo lol, i can't imagine a better plot than this tbh┗( T﹏T )┛)
He's so bbgirl ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄