From A Stronghold NPC To The Final BOSS - Chapter 527 526/Alliance

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

We follow the story of Song Lang, a genius in the police field, who due to unfortunate circumstances caused by his mortal enemy, now assumes the identity of a driver named Chen Shi. Although he had wanted to live out his days as an ordinary citizen, fate has other plans in store him. Finding himself in the position of prime suspect to a case, he assists a police officer to uncover the truth. Follow the adventures of Chen Shi as he is plunged back into the world of bizarre homicide investigations. Will he be fated to meet his enemy once again?

If you enjoy murder mysteries such as the TV show “The Mentalist”, or anime like “Detective Conan”, then this novel is for you.

Chu Nan was just an ordinary student, but because of an accident, he obtained the data collection, analysis and processing ability equivalent to the most advanced optical brain.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates