C346 Zhang kexin's apprentice

"Nine Yin Formula, where can I find it?" Ye Feng said anxiously.

Three years sounded like a long time, but he didn't have much time to calculate carefully.

Zhang Kexin's expression also became heavy. Although she did not know what kind of cultivation technique the Nine Yin Formula was, it was bound to be an outstanding treasure. It would not be easy to obtain the Nine Yin Formula