In Hanseong, the children have stopped dreaming, and one by one the kingdom’s oldest protections are coming undone. Marked by an ancient rite, Captain Seo-jun must cross the black water in pursuit of a stolen power, with the fate of a kingdom resting on his return. His search leads him deep into a foreign court, where every courtesy conceals a purpose, and towards a woman whose fate may already be entwined with his own.