Meanwhile, hoping for an audience with his father, Yeon Gaesomun's illegitimate son Choong, born of a slave mother, arrives in the capital. While on the road, the crown prince and princess are attacked in their carriage; Yeon Gaesomun and his allies had hired assassins to fake a Tang attack, since this could become grounds for war. Observing this from a rooftop, the masked Choong uses his bow and arrow to kill the one surviving assassin in custody, to prevent him from implicating his father. Shortly after, Choong and So-hee meet in the marketplace and fall in love at first sight.

After his father rejects him, Choong decides to make something of his life and becomes a member of the royal guard, with So-hee ignorant of his paternity. When he foils another assassination attempt, Choong gets recognized by the king's nephew Jang as the masked archer, and he is sentenced to death. Yeon Gaesomun preys on Jang's ambitions, and together they plot to save Choong from hanging, unbeknownst to the grieving So-hee, who believes he has died. But Choong cannot resist revealing himself to her, and the lovers joyfully reunite.