After losing his father at a young age in a terrible accident, Yong-hu abandons his faith and chooses to only believe in himself. Now Yong-hu has everything he wanted, that is until mysterious wounds appear in the palms of his hands.
Special ops squad "Hell's Bastards" are sent to infiltrate a civil war to retrieve intel. The unit soon find themselves trapped on a never-ending stairwell forced to climb or die. To survive, they must revisit their past sins.