"Exchange Cold Water" is a multiplayer online game with the background of ancient rivers and lakes, and the deserted village outside Bianjing is an activity place for catching fast. Against the background of three series of novels by China hero and Ryan, the novel tells a tragic story of night arrival at the end of the Northern Song Dynasty, which involves the life scenes of the Northern Song Dynasty, such as feuds between rivers and lakes, court disputes, gang vendettas, emotional entanglements, and various market situations.