The masked men that Yunzhu saw included Butler li and Xiao Shunzi.
Back at Mount Qiyun, when Yunzhu was having sex with Qi Moyu in the cave, the masked man who came in was Xiao Shunzi.
After Yunzhu left, Xiao Shunzi revealed his true face. Qi Moyu's lust was aroused, and he died in Xiao Shunzi's hands. His face was even scratched by Xiao Shunzi.
Que 'er's role in this was to help them send a message to miss Feng San, eavesdrop on miss Feng San and miss Feng SI's Secret plan, and after they arrived at Qiyun temple, she helped to transport miss Feng San in on the day of the crime.
The whole case was clear now.