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Su Chun and his wife, Hai Ping (played by Haiqing), have a deep affection for each other, but due to financial constraints, they are unable to buy a house in Jiangzhou and can only temporarily stay in an alley. Hai Ping is determined to change their situation, but the pressure of high housing prices is overwhelming. Even after giving birth to a daughter, they can only send her back to their hometown to be raised by her grandparents. Hai Ping's younger sister, Hai Zao (played by Li Nian), after graduating from university, falls in love with Xiao Bei (played by Wen Zhang), an employee of her company. Both of them also feel the bitterness of saving money to buy a house. Due to work connections, Hai Zao meets Song Siming (played by Zhang Jiayi), the secretary to the mayor, who falls deeply in love with her at first sight and helps her and her sister out of their predicaments on multiple occasions. In gratitude, Hai Zao becomes involved with Song Siming, and the situation spirals out of control. During this time, Hai Ping repeatedly advises Hai Zao not to betray Xiao Bei's true feelings, but Hai Zao, in order to help her sister achieve her wishes, still submits to Song Siming and becomes his "little third." Later, when the affair is exposed, Song Siming's wife (played by Wu Junmei) comes to confront Hai Zao, intimidating her. Hai Zao feels deeply humiliated. That night, Song Siming comes to comfort Hai Zao, but their intimate moment is caught by Xiao Bei... This film is adapted from the novel "Shelter" by the female writer Liu Liu.