The snowman case is from the TV series Crime Without a Certificate.

Crime without a license is a crime suspense online drama jointly produced by iQiyi and Huaying Xinrong Film, directed by Lv Xing and co-starred by Qin Hao, Deng Jiajia, Yao Lu, Dai Xu and Wang Zhen.

In January, 217, the online drama Crime Without a Certificate held its first media visit. In April 217, the international trailer was exposed at the Cannes TV Festival. In May 217, a poster of frozen figures was released. In July 217, the ultimate trailer was released. In August 217, the poster of Diablo series was released. In September 217, all creative groups attended the press conference in Beijing. On September 6, 217, it was broadcast alone in iQiyi.

Episode 1 "The Snowman Killer reappears in the Ice City":

The mysterious "Snowman Killer" shocked the whole criminal police team, and the murderer perfectly eliminated all clues, leaving only a note "Please arrest me", which made the police investigation into a dilemma.

In order to uncover the truth, the police leaders transferred the detective Yan Liang, who had been dormant for many years, and pinned his last hope on Yan Liang. Guo Yu, a trainee lawyer, met her first love girlfriend Zhu Huiru in a debt dispute involving black gangs. In order to help Zhu Huiru, Guo Yu, who had an old love, extended a helping hand, but she didn't want to get into real trouble.