In a monster-infested world, only those summoned by the Tower become hunters, powerful individuals with special skills. Despite his ardent wish to become one, Cho Hyunsoo is stuck slaving away for other hunters. But when a near-death experience gives him a chance to fulfill his dream by bringing him to the Tower, Hyunsoo seizes it, only to discover that he cannot leave until he reaches the 100th floor! Will this hunter successfully get to the top, or will his dream end up being a nightmare?