Donghae was a sm trainey before he had to leave to claim the throne as the prince of Korea ( lets just say its a monarhcy).  Before he left he promised to keep a realtionship with his girlfriend YoonA, who has now debuted in a group called SNSD. But what if Donghae happened to already be promised off to someone else.... What if this girl was practicly a sister YoonA.   Meet Jessica.