In the same prison as the thief Wang, he was called "the butcher on a rainy night". Ka Kui Wong wrote songs for him and Yam Tat-wah played him.

The butcher in rainy night is a human case in Hong Kong on 1982. The prisoner is Lin Guoyun, formerly known as Lin Guoyu. The trial started on March 3rd, 1983, and lasted for 20 days. On April 8th, Lin Guoyun was convicted of four murders and hanged. In August 1984, the Governor in Council pardoned Lin Guoyun's death penalty and sentenced him to life imprisonment.

This man is Lin Guoyun, known as the "rainy night butcher". After he was arrested, five psychiatrists made an in-depth evaluation for him, and three of them thought that he was not mentally ill, but committed crimes to meet abnormal sexual needs. However, different experts have different views on Lin Guoyun. Some experts believe that he has a high IQ and is suspected of deliberately lying to mislead experts.

Later, the film "The Butcher on a Rainy Night" based on this true event was released in Hong Kong. In this movie, Yam Tat-wah plays the perverted murderer Lin Guoyun, and Yam Tat-wah is indeed one of the stars with the widest acting roles.

Ka Kui Wong, the lead singer of Beyond, a Hong Kong emperor band, once wrote the song "Romance of Death (Part II)", which was inspired by the 1982 "Butcher on a Rainy Night" incident. Interested friends can listen.