[Decisive and ruthless + no female lead + fast-paced] [The protagonist has a strong sense of justice. Not for you if you dislike that.]
In his previous life, Zhang Aimin was a special forces soldier who died on a mission. He was reborn as a constable in the Great Qian Empire.
Ten days later, the apocalypse would descend. The world’s masters would retreat into the mountains to evade calamity, leaving demons and monsters to run rampant across the land, turning it into hell.
Fortunately, the Xuanyuan Divine Sword came to his aid. Killing evil people and monsters earned him merit, which he could use to learn martial arts!
So what if the masters withdrew from the world? So what if the immortals vanished? Zhang Aimin raised his blade to the sky. “I alone am enough to kill every demon and monster under heaven!”
Ten days until the apocalypse. Kill!