In order to benefit the people, Shen Fu, a wealthy man in the Ming Dynasty, paid for the construction of the city wall. However, during the construction process, a river monster ran rampant and destroyed the city wall, causing panic among the people. In order to appease the people, the emperor ordered Shen Fu to offer his heirloom cornucopia to suppress the evil spirits, and ordered Shen Fu and Li Hanyang, the left assistant minister of the Ministry of Works, to repair the city wall within three days. The river monster continued to commit crimes everywhere, and Shen Fu and his companions investigated and found that there was another hidden story. What kind of shocking secret is hidden behind this? While fighting the monster, how can Shen Fu solve the case within the three-day deadline?