I’ll Retire After Saving the World Manhwa

I Will Save the World And Then Retire, 세상만 구하고 은퇴하겠습니다
Year 2044.
Right before the global explosion of dungeons—the end of the world. And…
when I opened my eyes again, it was twenty years before the end. I, Woo Hwijae,
must stop the apocalypse to secure my retirement plan!