Fighting Yuan

After the Battle of Yashan, the small imperial court in exile in the Southern Song Dynasty was destroyed, and the Song Dynasty died. The Mongolian cavalry has swept across the world, and there are only a few rebels fighting desperately on the great rivers and mountains. Chen Daju, a modern college student otaku, accidentally traveled through time and became the righteous commander Chen Diaoyan. Should he risk his life and fight against millions of Mongolian cavalry, or should he cross the ocean and retreat to Taiwan to preserve the Han family's clothes? Boundless darkness is about to descend on the Chinese continent, and the Han nation is facing the danger of national subjugation and annihilation. Will China be allowed to fall for a hundred years? An iron curtain has descended across Eurasia. How will the modern otaku Chen Daju break through?