A simple summary is that this college student initially embarked on the road of revenge because he was gang-raped by a homosexual, but after the revenge was over, he did not stop, but continued to look for male homosexual targets.

The protagonist of the incident is Li Yijiang, a college student from Beijing Institute of Technology. One day in 2002, he was first drunk by four boys in a disco and then gang-raped. It is reported that these five boys, including Li Yijiang, are all active netizens of the "Purple Boy" website. The Purple website is a gay dating website, and the disco where Li Yijiang went that day is a common place for this group of gays. Because Li Yijiang got along well with these four boys in this place, he followed them to a residence outside the East Third Ring Road in Beijing to have fun. He didn't know whether he was drugged or something, but Li Yijiang got drunk and waited until he sobered up. Later, he found himself naked and tied to the radiator. The four boys first touched him and then took turns raping him. During this period, they also abused him with whips, candles and other objects. After what happened, Li Yijiang was heartbroken, but he would never let the people who hurt him have an easy time, so he embarked on the road of revenge.

He began to stay in various gay places, such as gay bars. Later, he found one of the boys in the bar street of Sanlitun. He followed the boy and secretly wrote down his QQ number while the boy was surfing the Internet. Li Yijiang made an agreement with the boy to conduct sex transactions online. On the day of the transaction, he prepared a Spanish military knife and took it to the transaction point between the two. While the boy was taking off his clothes, he stabbed him several times, killing him. Li Yijiang also cut off his genitals, and then Thrown into the trash can. The remaining three were killed by Li Yijiang in the same way, with the second victim having his throat slit.

After the revenge was over, Li Yijiang did not stop. His psychology seemed a little distorted. He began to look for gay men everywhere and target them to carry out criminal activities.