He has the peter pan syndrom (meaning that he thinks and acts like a kid) and a second personality (called Wonshik) and uuhm well even though his other side is an he is innocent and got sent to the prison because a guy who robbed a bank said that he was his partner and then killed two police officers and himself so the police believed that guy and said daehyun was his partner in crime.

Taemin, Key, Jonghyun, Luhan