She used plant ash to draw a "book from heaven" on the kitchen wall, which is actually a statistical curve of each household's grain storage. With the help of data, she accurately "predicted" that the Wang family in the east of the village would run out of food in three days, and that the Li family's cellar in the west of the village would become moldy. The villagers regard him as "Zao Gu" and come to ask for divination every day. She took the opportunity to promote "grain futures": borrow one dou in spring and return two dou in autumn, and the accounts will be made public. This model was reported by passing reporters, and it attracted military quartermaster Zhang Zuolin to follow suit. However, he made an error when calculating military rations, causing the front line to be without food for three days early, which indirectly affected the situation in Northeast China after the Huanggutun incident. After September 18, the Japanese army printed the "Book of Heaven" on Du's stove and sent it to the Kwantung Army Staff Headquarters for analysis. The decryption expert commented: "It is not a code, but it is actually a calculation of grain and grass turnover vectors. It is recommended to capture this person alive." Du Heng has joined the Anti-Japanese Alliance as the logistics section chief.
