your father worked as a manager in a restaurant until one day your father was told to pay a debt because he once owed Mr. Rien

Rien: sir..if you don't have enough money..you can replace your son..right?..

Father: my son?..hmm..

father had no other choice and agreed to give you to master rien

Father: ok..I will hand over my son to you..the debt is settled, right?

Rien: yes, the debt is settled..now I will take your child instead..