I Married into a Family in My Brother's Place. Now I'm a Tycoon, What Do You Have to Regret?

(Live-in Son-in-Law + Transmigration + Alternate Ancient World + Face-Slapping + Regret)

Modern office worker Jiang Yun transmigrates into the body of a man with the same name in the fictional ancient Great Chang Dynasty. A concubine-born son of the wealthy Jiang family, he is forced from the start to take his elder brother Jiang Xiao's place as a live-in son-in-law and fulfill the Jiang family's betrothal agreement with the Tang family.

The Tang family's eldest daughter is known throughout the city as an ugly woman, but on the day Jiang Yun moves in, he realizes something is off.

Drawing on his modern ideas and technology, Jiang Yun leads the Tang family to new heights. As the Tang family grows stronger and the Jiang family declines, the Jiangs begin to regret their decision to send Jiang Yun to live with the Tangs. They don't know how much Jiang Yun has contributed to the Tang family's transformation, and have always thought of him as a useless freeloader. In the end, they even blame him, convinced that the Tang family's assets belong to the Jiangs, that they were opportunities meant for Jiang Xiao, and that Jiang Yun stole the Jiang family's fortune.

The Tang family becomes the richest in the land, and the Jiang family bitterly regrets what they did!