Absolute Regression절대회귀

If I had to describe this in any way, I'd say it's more addictive than fentanyl.
Summary
While living as a mercenary, he learned from a companion about the existence of a regression technique that would allow him to return to the past.
In order to seek revenge and kill a specific person, he embarks on a journey to find someone who can create this regression technique.
He returns to a point just before the Demonic Sect is about to fall, all due to one person. His true identity is the second son of the Heavenly Demon.
What I liked most about this novel was its protagonist, who feels incredibly human. His dialogues and interactions, even considering it's a murim novel, feel remarkably good. I'd say he's the best Korean murim novel MC, at least for my personal taste.
The story arcs are well-developed and don't drag on unnecessarily.
If you're looking for a well-structured martial arts regression novel, this is your choice. You should definitely give it a try.

Absolute Regression

Send me to the past.” That’s how the first step toward revenge began.