C407 Professor Lin

At the very least, within the National Bureau of Special Ability, or perhaps in the eyes of Huo Xiangguan, the《 Mud Ball Sutra》 was a cultivation technique that was almost impossible to cultivate successfully, and there was no way to even learn it, let alone follow it up.

But in Duan Lingfei's eyes, the《 Mud Ball Sutra》 described the structure of the Human Brain in a complete and detailed manner