After getting drunk by accident, Zhang Yun slips and falls into the water, only to transmigrate into the body of a low-ranking runner in Kaifeng Prefecture, Tokyo, during the Song Dynasty. The emperor just happens to be Emperor Huizong, and Liangshan's band of heroes just happens to be around too. As luck would have it, he also transmigrates with the essential cheat for anyone crossing into another world: a System. See how Zhang Yun uses it to pacify Liangshan, crush Fang La, take on Gao Qiu and Tong Guan, and defeat the Jin and Liao.
