This is not a simple ghost's dream, but a forgotten, cruel and tragic collective oath:
On the eve of the Battle of Lanzhou in 1949, an "Iron Bridge Defense Team" composed of coffin makers, Yellow River rafters, Hui knifemakers, students, etc., Swore an oath on the old Iron Bridge (Zhongshan Bridge): When the city is destroyed, the people will die; when the city remains, the souls will be guarded. They used a secret technique to paint a red coffin and sealed a ray of living soul into the coffin. As long as the colorful coffin does not rot and the blood flow continues, their souls can anchor the city's destiny like "nails in the ground" and protect the peace of future generations.
But more than seventy years have passed, the bloodline has withered and the memory has been cut off. Those ten colorful coffins, which serve as the "eyes of the array", have long since sunk into the foundation of urban development and gradually become ineffective. As a result, the undead began to "tell dreams" and use their last strength to summon new "city defenders".
