( Chinese :28岁未成年) is a 2016 Chinese fantasy romance drama film starring Ni Ni , Wallace Huo and Darren Wang . It is the directorial debut of Zhang Mo, also known as Zhang Yimou 's daughter. It was released in China by Le Vision Pictures on December 9, 2016.
28-year old Liang Xia ( Ni Ni ) and 30 year-old Mao Liang ( Wallace Huo ) has been together for 10 years, and living together for 5 years. Liang Xia puts a lot of emphasis on appearance and dreams of a perfect wedding, wedging a distance in her relationship. To prepare for every aspect of the wedding, she enters a phase of premarital crisis. Mao Liang, on the other hand, is preoccupied with work and cares nothing about wedding preparations. He gradually sees the wedding as a nuisance and initiates a breakup with Liang Xia. The devastated Liang Xia eats a magical chocolate, transporting her memory back to her 17-year old self. Without the worries of adulthood, our heroine is back to her naive, optimistic self and that triggers a surge of interest in Mao Liang, who she now refers to as “Uncle”. Things turn even more complicated when Liang Xia's first love, Yan Yan ( Darren Wang ) comes back into the picture.