在得知妹妹失踪后前往失踪地寻找，不料一路上遭遇一个又一个的意外，遇到一群目的纯粹，以及目的不纯的陌生游客，还有令自己心动的女孩（李梦 饰），由此展开一场惊心动魄又令人忍俊不禁的故事。有人善始善终，有人恶有恶报。

A 14-year-old junior high school boy who likes astronomy was forced to practice the piano by his single father. Suddenly an alien appeared in the boy's bedroom, which completely changed the lives of the boy and his father.