After the population exploded and resources were exhausted, human life span began to be controlled at 75 years. Zhang Yi, a high school student known as an extremely evil existence, in order to save his grandfather from the death restriction, accidentally discovered that-the original mandatory death age was set to hide a secret that humans cannot bear. Since then, all kinds of unheard of people and things have been continuously involved in his life, and the most real side of this world is slowly unfolding to him!