"The Iron Coupon of the Alchemy Book" - a mysterious token left behind by the royal family of the Tang Dynasty. It is said that whoever obtains this iron certificate can command the three hidden forces in the world. The iron coupon is divided into three parts, each hidden in three places and guarded by three families. The kings of the seven kingdoms in the world all wanted it and wanted to unify the world.
The people in the world cannot speak, and the heroes speak and die for them. This is the common fate of all protagonists.
