The alliance between Song and Mongolia to destroy the Jin Dynasty was the biggest strategic mistake made by the Southern Song Dynasty. If the negotiations between Song and Mongolia failed at that time, how would history go? This book assumes that an accidental factor led to the failure of negotiations between Song and Mongolia to destroy the Jin Dynasty, and history changed from then on. The protagonist of this book, Li Siye, is a descendant of a declining clan in the Tang Dynasty. At the age of fourteen after the city was conquered, he was kidnapped to the Kingdom of Jin and became a slave. After several twists and turns, he regained his freedom and returned to Lin'an, the capital of his homeland, and gradually became a merchant. By chance, he poisoned the Mongolian deputy envoy who came to negotiate to jointly eliminate the money, causing the negotiation to fail. History went astray from then on, and Li Siye's own destiny also changed. This book describes the legendary story of a boy who grew from a slave to the founding emperor. This book is an imaginary historical novel, please do not contradict historical facts.