In what way did Yujin breach the contract? Can someone refresh my memory(⌒▽⌒)

Yujin fall in love to Aaron
Their contract said no feeling

i literally had to reread the first chapters when he said that lmao, but i think it’s because they stated in the contract that their relationship would be purely an act and because he now has real feelings for aaron it would make their relationship real and thus breach the contract i guess ?