Ren Xiaosu's perfect skill

When Ren Xiaosu listened in on Zhang Jinglin's lessons on top of the school walls, he had once heard Zhang Jinglin sharing some strange stories, including some that talked about "disappearing cities."

Sometimes, when Ren Xiaosu remembered Zhang Jinglin, he would feel that he wasn't always a serious person. Whenever this teacher got tired of teaching, he would simply take a chair to the podium and sit down to share some interesting stories to fill the class time.

However, Ren Xiaosu felt that this was quite normal. After all, being the only teacher in town, it would be quite difficult for Zhang Jinglin to only talk about lessons all day.

In the past, Mr. Zhang had told of an ancient city in the wilderness during one of his story sessions. The ancient city had been prosperous for some time but suddenly started declining for some reason. Zhang Jinglin said that it seemed like demons started appearing after the decline of the ancient city.