In an apocalypse where temperatures reach 55°C, Jiang Wei, who has traveled into this world, binds herself to a business system and starts selling sour plum juice for just two crystal coins a cup. Refreshing, revitalizing, delicious, and affordable, her drinks are instantly snapped up. She uses food and kindness to bring warmth to ordinary survivors, helping a poisoned young man and a heatstroke-stricken hunter recover and start anew. However, her success also attracts the greed and hostility of villains. Facing threats both open and hidden, she remains calm and steadily upgrades her business, transforming her mobile stall into a two-story shop called Chang'an Canteen. Through her abilities and sincerity, she wins the hearts of everyone in the base.