Tunnel Rat - Interlude: Between the Old and the New

Frank, a mercenary known for his cold ruthlessness, decides it’s time to leave the bloody world of the underworld behind. But the underworld has no plans of letting him go. Relentless enemies from his violent past keep hunting him, and eventually, they succeed—Frank is killed.But fate has other plans. Instead of staying dead, he is mysteriously reincarnated into the body of a cop in a world filled with crime, corruption, and dark secrets. With the help of a strange, all-knowing system, Frank is given the chance to live again—this time, to prevent crime before it happens.

Li Pu, who has the blood of a summoned beast, originally just wanted to lie down honestly, but found that his talent as a summoner seemed a bit unusual…

- Description from novelbuddy

He is an undead who is devoid of all humanity, he is the one and only supreme overlord, he is a man who has severe mysophobia.

The general of the demon world possessed the body of a third-rate small time celebrity. This was the story of him coming over, determined to make preparations for the demon world’s invasion of the human world, but accidentally got mixed in with the entertainment circle instead.