Lu Xin, who had been a good girl since childhood, ran away from home during her rebellious period and was persuaded to drop out of school. After transferring to a boarding school filled with almost all gangsters, she met the person she had liked for seven years. A few years later, that person told her: "You are the most beautiful accident I have ever encountered." And she knew in her heart that she and him were originally from two different worlds. Finally, seven years later, she got the news that he was going to get married...