Lin Mo, a clerk in the Lin'an warehouse, found his father's relic among the old papers - an ancient map marking seven secret docks. Crazy monk, old general, fierce boat girl... He gathered a group of low-level people and secretly built a navy in the Jiangnan water network. The Mongolian army put a reward on his life, the government wanted to seize his map, and the traitor was around. Three months later, the main force of the Mongolian army arrived. Can he survive until that day? Behind that picture, there is a bigger secret hidden.