Jihyun’s mastery of the blade did more than win competitions. It also made Haekyum, a sword-turned-legendary being, fall deeply in love with him. While Jihyun grapples with the loss of his little brother, Haekyum steps in to fill the void in his heart. However, things take a turn when Haekyum decides to confess his true feelings and reveal his identity. Doubt creeps in—is Haekyum just a replacement for Jihyun's brother or something more?