Modern youth Xu An time-travels to the Great Gan Dynasty, embodying the First Profligate of the State-Stabilizing Duke's Mansion. Right at the start, trapped in a marriage contract controversy, he relies on advanced wisdom to avert danger. Coinciding with the Dongyu delegation provoking the Great Gan literary circle, Xu An no longer hides his talents, amazing the entire audience with timeless masterpieces, and subduing renowned scholars and great Confucians with advanced arithmetic logic, shaking the world. On the surface he plays the world, but in reality he strategizes, secretly assisting the crown prince in carrying out disaster relief work and improving the secret method of making refined salt. Amidst power struggles and romantic entanglements, Xu An plays his opponents in the palm of his hand, turning from a good-for-nothing despised by everyone into a national-guarding prodigy.