Broke young man Chen Mo, burdened with debts, accidentally activates a mysterious bronze key left by his father. The back wall of the grocery store opens a dimensional light door, connecting to a doomsday wasteland overrun by zombies! Spicy strips for gold bars, instant noodles for crystals, he gets to know the ruthless female battle god Su Tang, uncovering the shocking secret of the "Gatekeeper". On one side, doing business across two worlds to build a doomsday trade stronghold, fighting against the conspiracy of the accounting room and the Gatekeeping Society; on the other side, going deep into the dangerous third layer, exploring the truth of his father's disappearance, and fighting against the void power. Shuttling between reality and doomsday, what is sold is snacks, and what is guarded is the survival of two worlds!