
JK was always sexually harassed by everyone around him because of his perfect face, everyone just approached him with the intention of taking sexual advantage of him.
So he got tired of being abused and started training martial arts and started defending himself from predators, and became a predator, that's why he treats people with disdain.
But KimDan, when he touched his private part by accident, apologized appropriately with respect, it was the first time that someone did not sexually harass him on purpose and still received a true apology.
JK didn't know it but he fell in love at that moment and since then Kim Dan is tattooed on his heart.