Shin Ji-eun is a skilled international secret agent recruited by the Korean National Agency for Intelligence and Counterintelligence (KNAIC), a powerful organization, to track down and capture a dangerous madman who plans to unleash an airborne virus on a large portion of the world's population through a high-tech drone system. But as she begins her mission, she discovers that the true identity of the madman is none other than her own biological father, Shin Min-ho. Desperate to learn more about the father she never knew, Ji-eun conducts her own investigation and hacks into the organization's database, uncovering shocking secrets about Min-ho's past. She discovers that her father was once the leader of the organization and that he had gone undercover on a mission to take down the madman, only to be killed in the process. Or so the organization thought. Now, with the world on the brink of destruction and her father at the helm of the attack, Ji-eun must race against time to stop Min-ho and uncover the truth behind his twisted plot. But as she delves deeper into the mission, she realizes that the only way to save the world is to confront the man who gave her life and confront the truth about her father's past and motivations. Will she be able to stop him before it's too late, or will she fall victim to the same fate as her father?