Kim Hashin, a low-ranking guardian god, is determined to make his town the happiest there is and get promoted to a higher rank. But his plan goes awry when Nam Dareum, a girl with an extremely low happiness level and no will to live, moves to town. Now Hashin must do everything in his power to make Dareum happy so that he can save her and everything he's worked for. As hardships and obstacles continue to mount, will Hashin manage to help Dareum find true joy in life and put his town back on top?