Hongbin is a young clumsy angel who got a task to be a guardian angel for Han Sanghyuk, a teenager that can't control his emotion. He also need to make Sanghyuk feel less lonely and happier. But because of his clumsiness, he often make Sanghyuk angry.  Sanghyuk is just a lonely kid who need attention from his parents. He often caused trouble in his school so that his parents his existence.