Water Margin: Zhen Mi, Don't Marry Him. I'll Steal Yuan Xi's Bride

Fang Chang transmigrates to the late Han dynasty and takes Zhen Mi as his wife, before she has been married off to Yuan Xi. He activates the Guilt Compensation System, stays at the Zhen family's summer villa to teach Zhen Mi to read and keep accounts, and sends assassins to stop Yuan Shao from sending a second delegation to propose marriage. During the Battle of Guandu, he secretly opens Ye City's water gates to help Cao Cao capture it quickly, sparing the Zhen family from a massacre. Later, he joins Liu Bei in conquering Jingzhou and Yizhou, oversees the imperial court's textile workshops and a system for registering female households, and is rewarded for his loyalty to the Han with the title of Marquis of Wansuiting.