Doomsday: My Store System with Delta

Lin Chuan's store system is very good, but the currency is a bit weird, like playing games. Start with a fruit knife and zero balance. The first pot of gold: kill zombies and earn haf coins. While others hoarded food, he hoarded guns. While others hide, he accepts the contract. When the doomsday boss exchanged grain for bullets, Lin Chuan silently opened the system mall: "Here are ten M9s and I can use my Huff coins."