Choi Yee-je, crushed by a severe economic crisis, perpetual unemployment, and the agonizing loss of his life savings to a phishing scam, stands atop a Seoul rooftop. Overwhelmed by despair and feeling utterly invisible to a society that rewards only the successful, he jumps to his death. However, his final cynical dismissal of "Death" as nothing more than a fleeting concept triggers a supernatural punishment. Yee-je awakens in a liminal, otherworldly waiting room and confronts Death, a powerful, cold deity personified as a woman. Offended by his flippancy toward the gravity of ending one's own existence, Death forces him into a ruthless game as retribution.Yee-je must experience the agony of dying twelve distinct times through the bodies of different individuals on the brink of death. If he can figure out a way to prevent the inevitable fatal outcome of any single host body, he is permitted to live out the remainder of that person's natural life. With each reincarnation, Yee-je is thrust into vastly contrasting lives—ranging from a terrified high school bullying victim and a reckless stunt double to a cold-blooded corporate heir, a hardened detective, and even a helpless infant. Armed with the memories and unique skills of each host, Yee-je desperately fights for survival, driven by a newfound, searing desire to live and protect the innocent.Along the way, he encounters Park Tae-u, a psychopathic conglomerate heir who orchestrates many of the violent deaths Yee-je is forced to inhabit, creating a deeply
personal vendetta. As Yee-je cycles through his lives, he begins to connect the dots of Tae-u’s reign of terror, utilizing his borrowed identities to gather evidence and plot justice. The emotional core of the narrative intensifies when Yee-je inhabits the body of a devoted detective, allowing him to finally witness the devastating grief of his
grieving mother whom he left behind. The profound realization of the immense trauma suicide inflicts on loved ones shatters Yee-je completely, shifting his ultimate motivation from mere self-preservation to absolute atonement. In his final, twelfth life, he occupies the body of his own mother. Witnessing her agonizing heartbreak drives him to the edge of despair once more, but he ultimately thwarts Tae-u’s deadly trap before succumbing to a fatal car crash. Ultimately, Death grants him leniency, allowing him to awaken back on the rooftop at the exact moment before his initial jump. Transformed by the visceral, harrowing lessons of his twelve lives, Yee-je chooses to step back from the ledge, embracing life with a renewed, enduring appreciation.