I Came Back as a Martial Genius

Demons came pouring from a portal that appeared out of nowhere and caused the Cataclysm. But all hope is not lost thanks to the Awakeners, people who can fight these demons. Jun Lee, a D-rank Awakener, is one of them. He fought demons heroically, but as someone who inherited nothing from his family, he could only go so far. As Jun Lee's life slowly whittled away, a system message appeared, informing him that a special martial arts route had opened...