C167 Dark night assassination

Ye Xiao walked alone with a book that the Old Man had bestowed to him in his hand. As he walked, he flipped through the books with rapt attention.

Suddenly, Ye Xiao felt an ice-cold aura come over. Ye Xiao stopped in his tracks. This was definitely not the cold air, it was something Ye Xiao was extremely familiar with ? Killing intent!

Why was there killing intent in this county