Min Ki-heon (Gong Yoo), a former intelligence agent on the verge of death, accidentally meets the "immortal" Seo Bok (Park Bo Gum) who holds the secret of human immortality. Min Ki-heon's last mission is to protect Seo Bok to a safe place. On the way, a huge consortium that wants to possess the immortal and various evil forces launch a large-scale hunt, which involves their escape process in a shocking and dangerous situation...