Lee Taemin and Kim Jongin, Kim Jongin and Lee Taemin. One was never without the other. Best friends for as long they can remember, they had a bond that no one could break.  Until Jung Soojung came into their life.  Beautiful, smart and kind-hearted Jung Soojung-- stealer of Kim Jongin's heart. And while Soojung had Jongin's heart, Jongin didn't (and would hopefully never) know that he held the heart that belonged to

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Kim Jongin is the guardian angel of sixteen-year-old Park Haeun but his job isn't just to protect her, it's also to make her happy. Though, that job proves to be easier said than done when there is nothing that can make the girl happy. Determined to complete his job, Jongin takes on a physical form and enrolls himself into Haeun's school, going by the name of Kai.