Runebound Reverse Tower of The Dead - Chapter 101: Thin Ice

[Requirement for aspect awakening has been met.][You have acquired a new aspect.][Aspect (King of territory): A legion of soldiers under your command, do as you wish with them.]...Alex lived a terrible life as a beggar, spending most of his time wandering the streets and begging for money.But after his death, rather than passing on to the afterlife like he expected, he was reincarnated into another world as the third prince of the Astrodial family, Sylus von Astrodial.Marked by the stars, Sylus soon found that he was the main light of the family; he alone had awakened the rare star everyone was dying to have.[The star of Catalyst.]Because of this, everyone loved and cherished him, giving him the nickname Child Prodigy of the Astrodial family.With his intellect and knowledge of the former world, Sylus continued to prove himself as a true heir of the throne.Building and governing his territory to be the best while also reinforcing his position to take the throne.Greedy nobles, self centered siblings and crazy cult, Sylus doesn't mind.“This time, I’ll do everything right.”Everything was working out for him.Little did he know that blessings also come with a curse and a slight drawback.[You have received the title Fated Prince.][Your fate has been maxed out.]

Through a mysterious portal, Chen Jin arrived at this strange place – a post-apocalyptic world where civilization had been destroyed.

Consequently, he found –

A piece of metal scrap
A robot trash collector
A battleground
A city
A ton and more of gold
A copy of high-tech documents
A…
In short, Chen Jin found a planet.

- Description from Novelupdates

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.

Karl Adelheit, a self-proclaimed ordinary student returning from military service.

And a nobleman who enlisted as a soldier and received Medals of Honor.