In the eighth year of Qianlong's reign, a "Golden Palace Bird Test" led to a shocking case of concealing disasters and greed for wealth, exposing the crisis of shrinking grain fields and empty granaries in the Qing Dynasty. Liu Tongxun, who returned home due to illness, was ordered to lead Gu Shan, Du Xiao and other newly appointed young officials to break through the siege and use their heads as a model to implement Qianlong's policy of opening up wasteland and increasing farmland. After two years of hard work, the grain fields turned from danger to safety, and the national economy gradually recovered. However, the corrupt forces headed by Tie Gongnan and Song Wulou openly challenged the newly revised "ban on land reclamation" law, raised taxes in the name of opening up wasteland, and cruelly exploited the reclamation people, causing Qianlong's reclamation cause to fall short. At this time, more than half of the 18 provinces in the country suffered natural disasters that had not been seen in a century. The national food crisis broke out again, and the foundation of the country was shaken, causing fierce turmoil in the government and the country. Liu and Gu were ordered to take the disaster-stricken areas in Zhejiang as a breakthrough point, insist on governing the farmland according to the law, and fight a life-and-death battle with the evil forces in the government and the public, and finally save the red line of arable land in the Qing Dynasty. Food security was established as the top priority of the country. However, as soon as the new policy was issued, it faced more acute challenges. The ecological disaster caused by excessive land reclamation emerged, and Liu and Gu once again went through fire and water.