Kyungsoo 

He was raised by his own lovng parents until an accident happened and he witnessed how his parents have died in a car accident. Since then no family members wanted to keep him, they were cruel. So he was forced to be in an adoption home, He grew up there and people treated him nicely and the little kids treated him like an umma. Everything was alright until one day suspicious looking people came to the adoption home and one of them eyed him. He looked away and dismissed it but then later that night he was kidnapped,drugged and taken somewhere. When he got to his senses, he was already..... a slave.