Who killed Qin Xiaowan at the murder scene?

Hello, Qin Xiaowan was killed by Yang Hui in "Crime Scene".

In the plot of "Ten Deadly Sins", Wen Xiaowan, an employee of the Eight Immortals Hotel, was found dead in the hotel elevator by witness Zhong Xian. After investigation, Hua Long, Bao Zhan and Su Mei learned about Wen Xiaowan's boyfriend It was Yang Zi, the chef at the Eight Immortals Hotel. When Wen Xiaowan's accident happened, Yang Zi had not been to work for three days and was hanging out in the bar.

Hua Long and others found Yang Zi. After interrogation, they found out that Wen Xiaowan had called Yang Zi before her death. Wen Xiaowan told Yang Zi and asked him to remember her. Then Yang Zi took Hua Long and Su Mei When the others came to Wen Xiaowan's rental house, Hua Long discovered that Wen Xiaowan was superstitious about fox fairies during his lifetime. Yang Zi couldn't stand that Wen Xiaowan always killed chickens to get blood in the middle of the night, and his hands were bloody. After many attempts to persuade him to no avail, he proposed to break up.

Su Mei told Yang Zi that Wen Xiaowan believed in the fox fairy because she wanted to win the love between the two. In the end, Hua Long and others found out that Wen Xiaowan had committed suicide and wanted Yang Zi to remember her forever and chose to end her life.