The protagonist died after he, along with his squad, served as a meatshield against a powerful demonic martial artist. He then woke up as his younger self, just a day before he was supposed to take the entrance examination for a sect; and he now had a cheat system. Because he wasn't really trained in any esoteric martial arts, he mainly utilized standard/basic techniques he had trained in before his regression although he later on acquired advanced techniques. H[s main choice of weapons is an axe and sword pair which is uncommon in sect-taught martial arts that focuses on a single weapon. The last time I read was he was accepted into a "university" of sorts after winning a tournament. Quite similar to Volcanic Age where both MCs are trying to change a grim future that awaits the Murim world. Nevermind, found it after 30 minutes of searching.