Introduction to the origin of the mysterious coffins:

The coffins in this series are called "whistle coffins". They are sealed with molten iron and have mechanisms inside. The brute force switch will only release poisonous gas. You must rely on the Zhang family. Only with this ability can the coffin be opened.

Zhang Qishan originally asked an ordinary soldier from the Zhang family to switch the switch, but he was too afraid that his arm would get stuck on the coffin, and he panicked and had his arm cut off by the pipa scissors. Zhang Qishan, who was extremely courageous, reached directly into the cave entrance, fumbled for the mechanism plate and rotated it to the right to open the coffin smoothly.

After opening the coffin, there was also a dead body lying face down in the coffin. Zhang Qishan fumbled for an ancient ring, and Master Ba recognized that the object might be a ring from the Northern and Southern Dynasties, so the coffin was probably During the Northern and Southern Dynasties.