C219 Exemplary length

"None of your business." After smiling at me, Shi Yu said, "This is a Demon Subduing Mirror. It can prevent any evil spirits from approaching me. You will follow behind me in a while. You can follow me wherever I go, understand?"

The Demon Subduing Mirror should be one of the Demon Subduing Mirror's magic tools. He had never heard of it before, let alone seen it with his own eyes