11-year-old Jung Si-woo always had to play alone during PE class. “I’m excluded from any ball games.” “Are you kidding me? Why are you the only exception?” “If I play with the rest, everyone will be excluded. Physically.” The strength that Jung Si-woo has is not from any hard training but just a power he was born with. When he turns 16 years old, the world faced a cataclysm, a huge castle appeared over the Earth out of nowhere. It began selecting special humans to grant them wings making them a Player and that soon changed the world. 10 years passed. Jung Si-woo with a supernatural strength has still not been able to forsake his dream to be a Player. While he was enjoying his jobless life, he saved a falling Player and unknowingly met the requirement to be a ‘Underground Player’. He became more special than anyone ever is! Now, Jung Si-woo brilliant dungeon strategy play begins.