Lin Keke was admitted to M University as a graduate student in order to follow her senior brother Lu Yuqiao, whom she had a crush on. After enrolling, she discovered that Lu Yuqiao and her senior sister Wang Rujie were lovers. However, Wang Rujie broke up with Lu Yuqiao in order to go abroad. As they got along slowly, Lin Keke fell in love with classmate Xiang Wannan. Although the two had promised to grow old together, the final outcome was not satisfactory.