Su Ling transmigrated into a 1972 novel world, carrying the calico cat system Huahua to complete transactions, collect energy, and repair the originally misplaced plot through running the "Little Grocery Store". The first main world is a period fusion world of severe cold disaster. She sells food, meat and vegetables, daily necessities, and heating supplies to Dawang Village, the Educated Youth Courtyard, and surrounding towns, while supporting key figures such as Wang Baozhu, Wang Zhaodi, and Song Lianhua toward better fates. Taking plane management as the main thread, combined with system tasks, commodity recycling, and ensemble mutual assistance, the story presents the protagonist's process of doing business in various worlds, providing emergency help without being overly saintly, and changing everyone's lives.