Yin Mulei smiled bitterly: "I saw that tree just now. It has appeared several times in the history of Trier, but it couldn't be completely resolved."

Since joining Trier's "purifier" team, he knew that there were many dangers hidden underground in Trier that were difficult to purify, and the brown-green giant tree was one of them.

He, his boss and teammates couldn't understand why Trier was built on those things in the first place.