Fifteen-year-old Tang Yiyi had a secret crush on her senior classmate, but her neighbor Lin Shifen, who was one year younger than her, intercepted her love letter and ridiculed her. Eighteen-year-old Tang Yiyi fell in love for the first time, but Lin Shifen made a fool of himself and sued his parents. Twenty-year-old Tang Yiyi said goodbye to her. Awkwardly, she and Lin Shifen began a sibling relationship, but they couldn't bear the pressure from the outside world and their hearts, so they broke up and left for a foreign country. The 25-year-old Tang Yiyi met Lin Shifen again, who had already become famous. This time, he, Lin Shifen, would not let her go easily!