Khitan boy Yelu Chu and Dangxiang Cheetah Wei Minglie, two souls from different time and space, were unexpectedly reborn on the land during the Qingli period of the Northern Song Dynasty. One is bound to the "Longitude and Latitude System" and works step by step in the intrigues of the court, trying to solve the mystery of the rise and fall of the three dynasties as a foreigner; the other is bound to the "Xiaoye System", struggling to survive in the wilderness of the Qinling Mountains, evolving into the king of the forest with the body of a cheetah. When a dying slave meets a lonely leopard cub, human wisdom and the wildness of the beast collide, creating a strange symbiotic spark. They are "others" in the Song Dynasty, but they have become each other's armor through suspicion and support - Yelu Chu stirs up the storm with his strategies and seeks life among famous officials such as Fan Zhongyan and Ouyang Xiu; Wei Minlie uses his sharp claws to tear apart the dark situation and protect his companions in the royal hunting ground and the border smoke. Two systems are linked and two lines run in parallel. When Liao and Xia march towards the Song Dynasty, these "two heroes" who transcend species will eventually carve their own legend in an unconventional way in an era that values culture over military affairs.
