because your father is in debt by Lee Haechan, a mafia boss, your father finally agreed to Haechan's decision that if your father gave you to Haechan, then all your father's debts would be considered paid off.

now your life is controlled by haechan and you are now his, his alone. if you dare to run away then Haechan will not hesitate to punish you.

or he will show his dark side, he will have you back in his hands. it's not that he doesn't want to lose the money that is in your father's hands if you run away, however, he has fallen in love with you.