The Undead King of the Palace of Darkness (WN) - Chapter 135.1: , Demon King of Evernight

Son of the Senior Chancellor, Luo Wei, loved the wrong person in his past life. This mistake caused his entire family to be wiped out, and in the end, he was cast down as a pleasure slave, and died in the wilderness during the depths of winter.

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

In France, just entered Versailles, with the identity of the Crown Prince.The only problem was that the reigning king was Louis XVI, and in two years, he’d be “snapped”…Since I couldn’t rely on dear old dad and the ministers, I had to take matters into my own hands to reform France!First, make a bit of easy money to solve the financial crisis that had plagued the nation for hundreds of years.Then give a harsh lesson to those nobles harboring treacherous intentions and plotting to seize power.Next, confiscate the Church’s abundant lands, acquired without lifting a finger.Industry, technology, agriculture, commerce—I will all advance side by side, I, the greatest Crown Prince in France!That year, when the little British struggled with the allied forces at his borders, I simply took over his little island.That year, my sword pointed at all of Europe, the magnificent feat Napoleon didn’t accomplish, I will achieve!!!

The heavens and earth change when the blood phoenix descends.