The Legend of the Shadowless Sword is set in ancient Korea and follows a skilled female warrior named Soha who is a member of a group called the Wind Demon. The Wind Demon is tasked with protecting the king and his kingdom from foreign invaders. However, Soha is betrayed by her own people, who try to assassinate her and frame her for the murder of the king. In order to clear her name and seek justice, Soha embarks on a dangerous journey to find the Shadowless Sword, a powerful and legendary weapon that can only be wielded by someone who is "shadowless" and has no attachments to the world.
Along the way, Soha encounters a young prince named Dae Jung-hyun, who is on a mission to avenge his father's death and save his sister from a group of barbarians. Soha and Dae Jung-hyun team up and their paths become intertwined as they face various challenges and enemies together. The story is also influenced by themes of loyalty, betrayal, sacrifice, and love.
The action sequences in The Legend of the Shadowless Sword are highly choreographed and visually stunning, showcasing various martial arts techniques and weapon styles. The film also features impressive set designs and costumes, immersing viewers in the ancient Korean setting. While the plot may be simple and predictable, the film's execution and artistic elements make it an enjoyable and engaging adventure.