Between courage and fear. Between monsters and men. A wall stands that must never fall. The story of an elite force making a valiant stand for humanity on the world's most iconic structure. When a mercenary warrior is imprisoned within The Great Wall, he discovers the mystery behind one of the greatest wonders of our world. As wave after wave of marauding beasts, intent on devouring the world, besiege the massive structure, his quest for fortune turns into a journey toward heroism as he joins a huge army of elite warriors to confront this unimaginable and seemingly unstoppable force.