C1585 Investigating the Situation

I turned my head to look and immediately saw a young man who looked like a student pass by me. His face was filled with a gloomy aura.

When I saw this, I was sure that there must be something on his body.

Thinking of this, I instinctively opened the Yin Eye. Immediately, I saw a ball of black gas following behind him. However, that thing did not have a shape, and I could not tell what it was