Lee Jae-jin, a security guard struggling to pay for his sister's surgery, awakens the mysterious Guardian System that grants him powerful abilities during a dispute with his colleague. When the company CEO Seo-yeon becomes the target of deadly attacks over a groundbreaking drug she developed, Jae-jin becomes her personal bodyguard. As they make it through one danger after another, their bond deepens into something more.
60 episodes.
Tags: Love at First Sight, Enemy to Lover, Counterattack, Genius Babies, Level-Up.