Prince Charming: Fain

Fain often recieves criticism about his appearance and movements. Questions such as, 'Is he a robot?' and 'He isn't a human, right?'. He can't control and blame them because he, himself doubt if he is even a real human. However, after receiving an order from a person he doesn't even know, he was sent to South Korea knowing nothing. He can't recall his past nor have any memories about himself. He only knew some things about himself. Being secluded for sixteen years, he didn't see any other person like him. Hence, when he came to South Korea, he observed people carefully while being inside a transparent box. How will Fain cope up with this feeling and fulfill the order given to him? Why is he even doing the order?