In order to become a full-fledged angel, Jang Jaera is given the task of going to earth and healing the hearts of four people in the span of 365 days. She doesn't expect it to be a difficult task, but upon meeting them she realizes that maybe being an angel isn't everything...    

At the secret base Kim Bum claims as his, the last thing he expects to see is a girl singing. And the girl he encounters isn't just any girl, but Kim So Eun, the victim of bullying and someone no one wants to get involved with. However one thing leads to another and she begins conversing with him... not knowing the change of destiny she makes for them both.