A century-old secret treasure has been revealed for the first time.
Zhang Zuoxiang, a minister of Northeastern King Zhang Zuolin, was a man of the hour in the Republic of China. The iron coat warehouse he built was said to contain the most important military supplies, secret files and treasures of the Fengjun Army. However, it sank into the ground with the September 18th Incident and no trace was left.
A forgotten copper key circulated on a street stall for hundreds of years, and finally fell into the hands of a group of young people who mistakenly fell into the chess game. They were plotted step by step and surrounded layer by layer, until the stone door suddenly opened in the mountains - Tieyiyiku came to life.
Dusty institutions, unknown corridors, cold and well-trained trackers, and the secret behind the door that can rewrite the modern history of Northeast China... History has never gone far, it is just waiting underground.
