As tensions rise between North and South Korea, KCIA Foreign Unit chief Park Pyong-ho and Domestic Unit chief Kim Jung-do are thrown into a race against time. A high-ranking North Korean official has requested asylum, and the two units are tasked with uncovering a North Korean spy known as Donglim, who is believed to be deeply embedded within their agency. But when top secret intel begins leaking out and threatening national security, the two units are each assigned to investigate the other, leading to a high-stakes game of cat and mouse as they work to uncover the truth and bring the spy to justice before it's too late.
