Novel The Hunter That Returned From Hell
18 years old Yi Kang-Ho's life was perfect until he was sucked into a portal which transported to a Hell like world. In this world he had fight creatures, monsters, demons. He risked his life for 400 years and one faithful day he managed to somehow escape the Hell and came back to earth but even after spending 400 years there only 2 years had gone by on Earth.
Earth was totally different from before dungeons appeared everywhere, Hunters became the new government of the new world and the world became dog eat dog world.
Follow the journey of Kang-Ho in this new world filled with adventures.