Jiang Lin, a former border negotiator, was reborn into the ordinary world three days before the end. There is no space, no superpowers, and no aura of being a heartthrob. His golden finger only has the terrifying "insight on human nature" accumulated in the three years of his previous life. When the world collapsed, the rich were willing to exchange their assets for a piece of moldy bread; the cold school belle tore off her disguise just to grab half a bottle of mineral water; the military officers begged him to teach him about doomsday psychological warfare... Jiang Lin did not charge into battle like a traditional strong man, but relied on "mind reading", "negotiation" and "resource replacement" to build a solid "doomsday psychological utopia" in troubled times. But in the end, he discovered that this doomsday disaster was actually a huge scam created by those who had mastered top-notch violence to cover up their sins.