Tinsmith Shen Yanqiu walked lamely through the streets of the Japanese-occupied area. There was information hidden in the interlayer of the tin pot. His wife Ah Heng replaced the grain ledger with the Book of Songs and put it in the ancestral hall. The chief security officer, Zhao Mandun, tampered with the accounts of the maintenance committee. The teacher Zhou Qiyuan passed the code while filling in the pages of the book. There are no guns, just a group of people who keep the truth in lies and hide fire in ashes. After all, they were not written into history, but the tin fire was always bright, shining on their homeland.