The protagonist, Chen Mo, is an orphan who has just been diagnosed with a rare blood disease. The doctor says that without a matching bone marrow donor and money for treatment, he has only 30 hours left to live. He can't even afford painkillers. As he teeters on the brink of death, he binds to the [Lie Flat Lifespan Extension System]. Lie flat for one minute, and he gains one hour of life. He can also exchange points for treatment fees, a bone marrow donor, and supernatural abilities. He lies flat beneath an overpass, then on a hospital bench. Along the way, he runs into thugs looking for trouble and a con artist trying to swindle him. The System automatically triggers a "lie flat counterattack": the thugs are sent flying when they touch him, while the con artist ends up paying him instead. Within 30 hours, Chen Mo not only extends his life, but also exchanges for a perfect bone marrow match and top-notch treatment. Later, he uses lying flat to unlock wealth and connections, discovers that he is the heir to a wealthy family who was separated from them long ago, and picks up underlings and crushes his enemies along the way, becoming an urban legend as he lies flat.
