My life as a Hunter

The story is about Jin-Woo, a hunter who is on a quest to find a key in the underground temple of Arktar. He accepts the challenge from an unknown number representing the gods, but he loses his teammates during the journey, and one of them betrays him. He feels powerless and defeated after the event. However, he accepts the challenge again to try and find the key, but this time, he must face it alone. Along the way, he faces powerful monsters and challenges.