Ep. 1: Sung Jinwoo, pemburu kelas E terlemah, menemukan pintu masuk dungeon tersembunyi setelah misi rutin.

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Ten years ago. Passages called "gates" that connect another dimension and this world have appeared, and people who fight the monsters lurking on the other side of the gates are called "hunters." Hunters are ranked according to the amount of magical power they have when awakened, and Sung Jinwoo was said to be the weakest among the lowest E-class. One day, Sung Jinwoo participated in a dungeon. After clearing the dungeon, there was another entrance at the back. (Source: Official site)