Omnipotent Husband System - Chapter 18: Han Lingshi’s Enemy.

An ordinary student accidentally traveled into an other universe and became the king of a small kingdom. He had gotten a “Cheating Code” of life and was able to complete something extraordinary. This is the story about a king that was able to conquer continents and leave behind him an ultimate legend that will be recited between every generation to come.

- Description from novelupdates

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

This is a time of great powers: The vast Persia, Sparta that is founded by force, Athens with its trade and business, Thebes the rising star, The ambitious Macedonia, The twin heroes of the Western Mediterranean, The rising Rome and so on.

This is an era of brilliant stars: Agesilaus II – the last king of Sparta, Epaminondas – the Rising General of Thebes, Philip II – the founder of Macedonian hegemon, Dionysius – the tyrant of Syracuse, Camillus – the Roman dictator and savior…

This is an era of contention among a hundred schools of thought: Plato – the great philosopher, Antisthenes – founder of cynicism, Pythagoras – school of number, Democritus – the encyclopedia scholar, Hippocrates – the father of western medicine, Aristophanes – the great dramatist…

What will the hero bring to the world when he comes to this age as a humble mercenary through rebirth?

- Description from Novelupdates

[Wsa entry.]James Dohan, a famous author working for the government, suddenly died after an accident occurred at his workplace.Nothing could have prepared him for the events to come.[You have reincarnated.]James soon found himself reincarnated into the body of Jared, the son of the village's elder in a demon-infested wasteland.The North, abandoned by a cowardly kingdom after a brutal war, crawled with monsters and desperate survivors. Jared left to save his father with a miracle cure, but James arrived too late—the Elder was dead, the village was starving, and the title of Elder fell on his unprepared shoulders.Luckily, he had a cheat code to rely on.[You have awakened your Infinite Item Shop System.][Current balance: 0 Sp. Buy everything, Sell anything.]Jared found a way to save the people of his village from dying from their own weakness and the horrors of the world.[You have gained 50 Sp.][You have purchased a pistol.][13 Sp has been deducted.][You killed a Dire Wolf.][150 Sp has been added to your account.][The villagers' loyalty to you has risen.][You have earned 300 Sp.][You can now convert this world's money into Sp.]With this system, Jared was more than ready to conquer the North, money, power and women.