I want to find a story about kris and bark..  Baek's father in debt with kris before he died,  so to pay all the debt,  his mother sold baek body to kris .. Everytime kris used baek body,  will decrease the debt..  The made up like aa contract..  Baek still students but kris dont mind that..  He will contact his mother if he want baek.. I forgot the title...  Can somebody help me if u know the title?  *_°