You’re saying this as if Kim Dan wasn’t doing enough already
That is because he is traumatized from his own life. He was always poor and i'm Sure He was only just surviving/living for grandmother before meeting jjk. He never had an easy life and his only emotional pillar/support System was his grandmother.
He is grateful towards jjk bc He helped him out while the others were straight up mean toward him. His old workplace where He was wrongly fired. His debt collectors chasing and threatening him.
For him jjk was his saviour. He helped him out with the debt, paid for grandmothers Hospitals Bill and Upgraded her treatment. He was also nice toward his grandmother.
If this Incident didnt happened He would have stayed with him, no matter how jjk would have Treated him. He ran away bc He thinks He is a hindrance to jjk. Not because he was fed up with the situationship.
I thought he was acting like that because his grandma died!! But no he’s just being a baby over that jerk… When did Jaekyung ever gave him grace that he’s so heartbroken over him. Why are you acting like this when your grandma is right there and needs you to be present? Like I get it he’s trying, but what are you doing to yourself? Ugh…