Sebastian, a security guard with an invincible set of martial skills, accidentally offends Olivia, a billionaire heiress. While Olivia investigates him relentlessly and her wealthy suitors view him as a threat to be eliminated, Sebastian lives in fear that his secret identity—the sole survivor of a legendary family massacre—will be exposed. However, as he is assigned to protect Olivia, he discovers she is the very childhood friend he vowed to safeguard. Caught between his duty as a guardian and his burning quest for vengeance against those who murdered his lineage, Sebastian must decide if he can reveal his true face to his queen. The warrior has returned, and his revenge is about to take center stage.