Zhao Sheng (pseudonym), a 21st century young man from modern times, accidentally traveled to the period of Zhao Yu, the Duzong of the Southern Song Dynasty, and his soul transmigrated into the 9-year-old prince Zhao Yu. At this time, there was only less than ten years left before the demise of the Southern Song Dynasty. The court was controlled by the powerful minister Jia Sidao, and Mongolian cavalry was suppressing the territory. As a time traveler, he has modern historical cognition and thinking system, but he is faced with the difficult-to-return Southern Song Empire and the unprecedented situation of national subjugation.