Lumberjack

At the pinnacle of the colossal Demon God Tree, it is said that any wish can be granted. To conquer its perilous heights, opportunistic explorers bring along disposable slave pathfinders known as "Lumberjacks"—cannon fodder forced to brave lethal hazards in their masters' place. For a Lumberjack, there is only one path to freedom: survive one hundred ascents. Having miraculously endured ninety-nine grueling expeditions soaked in blood and betrayal, Jack stands on the brink of liberation. Whether he achieves freedom or meets his demise, thus begins the final ascent of the Lumberjack Jack. (Source: Naver, translated)