A young female surgeon joined a university hospital at an unprecedented speed. Rumors have long circulated about her connection to a notorious and sinister figure within the industry. However, the patients remain unaware of this truth. Hidden within the dark underbelly of the medical world, a group known as "BLACK JACK"—shadow doctors—take on a unique role: accepting requests from victims of accidents that occur within the hospital's confined walls and collecting payment in return. Their existence serves as the key to uncovering the secrets lurking behind the medical frontline.