When Na-Gyunn’s twin brother, Na-Jin, is murdered before his very eyes, he vows to avenge his brother’s death by assuming Na-Jin’s identity. But although the two may look alike, when it comes to fighting, Na-Gyunn lacks the talent and skill his brother possessed. In order to successfully execute his plot for revenge, Na-Gyunn resolves to train himself to become the prodigious knight-in-training his brother once was. Will Na-Gyunn be able to keep his identity a secret before others begin to catch on to his act?