I Was Switched at Birth with the Male Villain

Blurb One: In the male-oriented novel The Great Tyrant, the male lead, Bo Qiyan, is the legitimate eldest son of a marquis's household. But after being switched at birth, he is cast out into the slums. With his ruthless methods, he carves a path through bloodshed and eventually becomes an emperor for the ages. His grand and tumultuous rise begins when he is recognized and brought back to the marquis's household. You Xing, unfortunately, transmigrates into the cannon-fodder impostor cat who took his place and enjoyed more than a decade of wealth and privilege.

Blurb Two: This is a story about building a world and improving people's lives. You Xing believes that in this ancient world, where productivity is low and technology is virtually nonexistent, survival demands fundamental reform.

P.S. Since we're building a world, of course we'll change women's status, too! This story is set in a completely fictional world, a very fictional one! A sickly, ruthless beauty of a seme X a sharp-tongued, playful pretty uke. Content warnings: 1. The uke is disfigured at the beginning, but recovers quickly. 2. The seme is not a good person.

Theme: To be added.