Cho Kyuhyun is a young detective for the Seoul Metropolian Police. Lee Sungmin, also known as Kyanite, is one of the best jewel theives in the world.

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They are bound for each other, Their parents always say. But Sungmin loves somebody else. While Kyuhyun tried to wait for her. But, Just when Sungmin have learned her lesson, Kyuhyun left her. Is it too late for second chance?     -----------------------    

Sungmin's high school crush Kyuhyun accepts his love just like he wanted. But, to Kyuhyun Sungmin's love is nothing but a game.