Level Up with the Gods, Vol. 1 (manga)

After the world as he knew it came crumbling down, ordinary college student-turned-warrior Yuwon Kim, made his way to the Tower in the company of the Inner Gods. But even with his hard-earned skills and mighty companions, taking on the Outer Gods was an impossible feat—at least this time. Given a second chance, Yuwon returns to the beginning, before it all began, with a promise to return and fight again. Armed with the knowledge of a returnee, can he level up once more and find his place among the Gods?