He Returned From Another World… with Trapped the Goddess

Kim Minjun was summoned to another world and forced to survive hellish training until he became insanely powerful. But when the goddess tries to send him back to Earth without the powers he earned, he refuses. Instead of obeying her, he uses forbidden dark magic, escapes through a portal, and returns to Earth with a body strong enough to destroy monsters with his bare hands. But the world he comes back to is no longer normal. Dungeons are spreading, monsters are attacking, and the military is desperate for powerful hunters. Now Kim Minjun joins the Hunter Corps, not to become a hero, but to recover his full power and clear every dungeon in his way. Manhwa recap, fantasy action, overpowered MC, dark mage, dungeon hunter story.