Resisting the Invasion Starts with Unlocking the Store

Qing Ming accidentally activated a system called "Business Assistant", which can give ordinary items special effects... When the monster nest wakes up, disaster strikes. A strong man is seriously injured and bleeding. He accidentally discovers a sign at the door of a convenience store that says "You can buy everything." After a moment, the strong man looked at the spinach in his hand, swallowed his saliva, and doubted life: "You... Call this styptic grass?"