Beside the academy was a Gu room. The Gu room was not big; it was only 60 meters2 in size.

In a Gu Master's road to cultivation, a Gu is the key to strength.

At the end of class, the excited teenagers rushed towards the Gu room.

"Form a line, enter one by one," some voices suddenly yelled; it was natural that there were guards outside the Gu room. The youths went in one at a time and came out. Finally it was Fang Yuan's turn to enter the Gu room.

This room was a mysterious room. The four walls all had holes; in each one of these embedded square holes were another square hole. Each of the holes differed in size, some big and some small. The bigger ones were no bigger than a an earthenware cooking pot, the smaller holes no smaller than a fist.

In the many square holes were all kinds of containers—there were grey stone basins, verdant jade dishes, exquisite grass cages, earthen stoves etc. These containers kept in all kinds of variety of Gu.

Some Gu were silent, while some Gu made a lot of noises, creating chirping, clucking, rustling sounds and so on. All these noises combined together to create a sort of life symphony.

"Gu are also divided into 9 big levels, following the s