A Qingbei master's student transmigrates into the heir of the Duke of Xiguo. His father has just been transferred away, and 100,000 cavalry are bearing down on Xiyang Pass. With the supply route cut, he defends the isolated city alongside his younger brother, who grew up on the frontier, and gradually builds his strength. After becoming involved with a princess, he gains skills that continuously strengthen his military, infrastructure, and commercial capabilities. He sets out to carve out a haven in an uncertain age of chaos.
