In the Joseon Dynasty, two friends who grew up together, one the master and one the servant, reunite post-war as enemies on opposing sides.

Set in the Joseon era during a tumultuous time in the aftermath of war, take a journey through the lives of two childhood friends-turned-adversaries: Cheon Yeong, a slave with remarkable martial prowess; and Jong Ryeo, Cheon Yeng's master and scion of Joseon's most influential military family.