Kyuhyun is a troubeled student in SM Highschool. He hate his life because his father was jailed and people  always thought He is a criminal like his father. He used when people avoiding and suspecting him, until he starting to believe that he's a bad person. He has no friends in school because everyone is affraid of him. His life was as dark as night sky...

Until he come..

 Lee Sungmin, whose smile as bright as morning sun. The one who never gave up on Kyuhyun's good sides when everyone else does.  The one who stand up to defend him when everyone else don't. The one who stay even when Kyuhyun ask him to leave. Sungmin reminded  him  about  happiness and dream that seems had been vanished from He's mind. And he doesn't know since when sungmin's smile always stays behind his eyelids, until he finally found Sungmin had become his only sun.

But happiness will not last forever, right? And all the trouble started when Kyuhyun's father back...