In the second year of Shaoxing, the Chuzhou Loyalty Monument was struck by lightning and cracked. The stele builder Shen Yunji discovered secretly engraved symbols on the underside of the stele - the order of Liangshan's 108 generals turned out to be a set of military codes. Tiangang 36 corresponds to the northern pass, and Disha 72 corresponds to the hidden ferry. Song Jiang's surrender was not cowardice, but to send a northern defense map that he had sacrificed his life to the court. And the person who designed all this never appears in any story. He is the 109th general. The monument has been cracked for thirty years, and no one can solve it. Until now.