Su Yunjin (played by Liu Yifei), who looks gentle and quiet, slowly falls in love with her high school classmate Cheng Zheng (played by Wu Yifan) under the affectionate pursuit. However, it is difficult to fall in love and get along with each other. The differences in their living environment and personalities since childhood have become a problem for the two. The constant discovery of problems and contradictions finally leads to the emergence of feelings...