During the chaotic period of Ming-Qing dinasty transition, after failing to protect and preventing the downfall of Gwanghaegun, Tae-yul, the best swordsman in Joseon, lives in seclusion with his daughter Tae-ok in the mountains. As Tae-yul's eyesight begins to fail due to an old injury, Tae-ok seeks to find a treatment for him. When she is captured and taken away by slave trader Gurutai, Tae-yul is forced to raise his sword again in order to save her.
