I Opened a Shop in the Apocalypse Game

Li Yue somehow became an NPC who runs a shop in an apocalyptic game. The little shop in the starter village was in a sorry state, with only a limited supply of clean water for sale each day. That was, until Li Yue became the shopkeeper. Li Yue discovered that the shop could be upgraded! The players: Huh!? Is this really still the starter village? So the shop in the starter village is actually the most powerful apocalyptic shop of all? Theme: Fair trade, based on mutual consent