Unemployed young man Lin Shen unexpectedly joins the mysterious "Space-Time Management Bureau", only to find that the so-called "entry training" is actually a fatal mission world called "Death School" - find the messenger who controls death within 72 hours, failure will be completely obliterated. When he, veteran Chen Feng, and mystery writer Su Qing struggled to survive in the strange campus, he realized that this was just the beginning of an infinite reincarnation.