Kai is the most popular guy for his smartness and talents in every aspects. He was a dream guy of every girl. But, he was really meant and cold to the girls who try to close with him. Despite of that,in the depth of his heart, there's a girl that he really loved. Krystal,who is his lovely girlfriend was just an ordinary girl. She was not born in a wealthy family as him. They loved and cared for each other but they had to hide their relationship from others because they knew their parents will do everything to split them. For him, she was the most precious gift from God that he ever had. She's the one who fill the emptiness and lonliness in his heart. He'll always protect her whole-hearted. And for her, he was the only guy who really loves and cares for her, who always on her side in joyness or sadness. Their love was too pure and innocent that they really love each other and never can be apart. But, what will hapen if someone try to break they had built together? Do their live stands forever? Or one of them have to give up and leave away?