A misunderstanding caused Li Dawei, a young man from Earth, to live in an "alien apartment" and become a strange roommate with the slimy alien creature Karuru. Under the turns of spying by female agent Qin Miaomiao, they made a series of jokes in the city, but unintentionally got involved in the interstellar power struggle. As the alien fleet appears and the crisis on Earth escalates, the old rifts become fetters of fate. Laughter and fighting are intertwined. In the process of "trapping" and saving each other, the partners realize that they have achieved true growth towards their original selves. In the end, humans and aliens learn to coexist, ushering in a hilarious and profound examination of friendship, sacrifice and hope.
