The envelope the Blade Master sent contained a murder case that happened twenty years ago recorded in detail!

In Liangchuan, Gansu Province, a small county town in northwest China, nine brutal rape-murders occured in the 1990s. The victims were all young women aged twenty to thirty, their bodies completely mutilated—nipples and skin torn off as well as genitals sliced off by sharp weapons. So far, the murderer remained on the loose.

I previously heard about this unsolved case, but I didn't quite understand the Blade Master’s purpose

After perusing the files, I noticed two names on the last page–Sun Tiger and Song Zhaolin, dated 2002. It turned out that Grandpa had personally investigated this case and it was...