Lottery Grand Prize. 25-year-old Seo Dojin wins 2 billion won after taxes. Just when he thought he could escape his miserable life as an orphan, he gets entangled in the transmigration of a man he bumped into on the street. There's no way back. All he has left are a few special abilities exchanged for his 2 billion won. Well, since things turned out this way, might as well become stronger in this other world and live a life others would envy. Let's go. To the Great Labyrinth.