Absolute Regression is a standout in the "Hardcore Murim" category. While many series in this genre rely on a "System" or a "Cheat Code," this one relies on the trauma and muscle memory of a man who was once the world's most efficient tool of death.

Since you've been reading titles like Academy's Genius Swordsman and A Returner's Magic Should Be Special, this series offers a much grittier, more "Seinen" (mature) alternative to the typical academy setting.

Alternative Names and Titles
Absolute Regression / Jeoldae Hoegwi / 절대회귀 / Oneulman Saneun Gisa

The "Assassin's Logic" Power System
Kwon Hwi’s regression is unique because he doesn't just return with "power"—he returns with knowledge of the flaws.

The Anti-Martial Artist: In his past life, he was an assassin tasked with killing the world's greatest masters. Consequently, he knows the "blind spot" of every major sect's ultimate technique. He doesn't need higher Qi to win; he just needs to strike the one point where the enemy's defense is mathematically zero.

Internal Energy Refinement: He utilizes the "Absolute" cultivation method, which focuses on purifying Qi to a degree that makes his internal energy far more potent than those with larger, but "dirtier," energy pools.