Which novels had male leads with the surname Qin?

It seemed to be a novel from a romance magazine. The female protagonist's family was from the military. She had a child betrothal, but the female protagonist didn't like childhood sweethearts. The female protagonist played the violin since she was young and fell in love with the violin teacher's nephew, who seemed to have the surname Fu. The man with the surname Fu was one or two years older than the female protagonist and went to university ahead of time. He came back to look for the female protagonist. Later, he died protecting the female protagonist in a car accident. The female protagonist became a gangster because of guilt. Then, she changed her ways and went to the university where her first love was, which seemed to be Tsinghua University. After that, she had sex with the male lead and began an irreconcilable relationship. She had children before marriage. The female protagonist's childhood sweetheart had always been by her side. After the female protagonist got pregnant, he took the female protagonist to the United States and wanted to marry the female protagonist again. The male lead seemed to know the female lead's second brother. In the end, the male and female protagonists live happily together