After leaving his secluded mountain retreat, the mysterious magic master Allen descends into the modern world to honor an old promise. Concealing his extraordinary abilities, he assumes the identity of an ordinary driver and enters a contract marriage. While keeping his true strength hidden, Allen secretly shields his wife from danger, using his magical powers to overcome one crisis after another and outsmart powerful enemies. As wealthy rivals underestimate him and the elite conspire against him, Allen gradually reveals the terrifying extent of his abilities. From an unassuming chauffeur to an unrivaled master, he takes revenge on those who wronged him, protects the woman he loves, and proves that his humble appearance hides an extraordinary legend.