He was left back by the person he loved. Only by him staying he was able to help this person leave the wonderland. He lives in a bath house in a magical world. There's no way for him to escape, he is bound to that house forever. He's the slave of a witch called Yobaba, she's treating him bad and beating him up often. Haku is craving for human touch and wants to be loved again, but he's scared of getting hurt again, sho he closes up and acts mature and cold-hearted. he's pretty confident.