Back in high school, Tang Shuang mistakenly took Lu Jianxing for Lin Yi, unknowingly beginning a young girl's case of mistaken-identity unrequited love. Although Tang Shuang wants to stay away from Lu Jianxing, her mother rents a house belonging to the Lu family. As they spend their days together, the two go from being at odds to secretly falling for each other. Just as their feelings reach their sweetest moment, their parents suddenly announce some marriage news.