In a stark and unforgiving medical facility, a young woman known only as Madonna finds herself trapped in a chilling reality. She is a "vessel," a living donor kept in a state of suspended animation, her body harvested for organs to save the wealthy and powerful. Her quiet existence is shattered when a new, high-value patient arrives, a mysterious and gravely injured woman whose presence ignites a dangerous spark of rebellion within Madonna. As the facility's coldly efficient staff, led by the formidable head nurse, maintain their ruthless order, Madonna begins to question everything she has been told about her purpose. Driven by a newfound and desperate will to survive, she embarks on a perilous journey to uncover the truth about her own identity and the dark fate of the stranger who has changed everything. This tense and atmospheric thriller, starring Kim Hye-soo and Kwon So-hyun, explores the brutal cost of life in a world where humanity is a commodity, building towards a gripping struggle for autonomy against a system designed to erase it.