Taken from his home as a young boy to master the deadly craft of poison, So-Han Jin comes back to his village with a single mission: to find the New Moon Sword Dancers who nurtured him. Instead, he learns of their fall to a malevolent group that now dominates the region, taking some of his mentors captive. What starts as a hopeful reunion turns into a vengeful journey for So-Han as he hunts down the missing dancers, ready to wield poison against any obstacle in his path.