C234 Theory of prolonging life

Yu Han entered through a long tunnel, and the mud below him settled down. When he swam, he was extremely careful, not daring to bring the mud down any further, because if he did, he would very likely be exposed.

After swimming through the passage, he saw the light barrier of a formation. Luo Xuehan had already explained the formation barrier to him.

At that moment, seeing the real formation