Prophecy Begins with Credit

In ancient times, there were people who loaned knives to people on credit, leaving behind prophecies (chèn) and waiting for the prophecies to be fulfilled to come and collect the money. Nowadays, there is a credit system, and prophecies are left behind on credit and people at the same time, but when the prophecies come true, you will get more than just money... Zhang Yangyi owed a large amount of foreign debt for treating his girlfriend's illness. However, her girlfriend left him after she recovered. Frustrated, he prepared to sell the ancient ancestral sword to pay off the debt, but unexpectedly activated the system. The prophecy of the first mission is that if your hall is black, little sister, there will be a bloody disaster in the near future... (This story takes place in a parallel world and is purely fictitious. Any similarities are purely coincidental)