Type-Moon, You Call This the Han Dynasty?

Bai Mu transmigrated to ancient times. After enduring natural disasters and reaching the end of his rope, he was on the verge of starving to death when an old man handed him a bowl of talisman water and said it would make him better. Bai Mu promptly decided to cling to the old man's coattails. Then he followed him across the land. He saw the few lines in the history books about people trading children to eat, and the casual mentions of a thousand miles of scorched earth. One day, the old man shouted the slogan, "The Blue Heaven is dead; the Yellow Heaven shall rise!" Bai Mu knew he had to do something. Then he saw the other side deploy Gundams dozens of meters tall, thousands upon thousands of Tiger tanks, and airships floating in the sky. You call this the Great Han!? ------ Two thousand years later, Bai Mu is summoned in the modern era. Nobody told me I was transmigrating to the Type-Moon Great Han!