C1625 What Is the Clue?

Zhou Yi's speed was not slow. In just a blink of an eye, he had already caught up to that stream of black energy.

But by the time he had caught up to the energy, it had already drilled into the interior of the library.

Zhou Yi also followed him in with a flash.

However, after entering, Zhou Yi found that the black shadow had already disappeared.

Zhou Yi was curious