Li Muzi, an ordinary high school student, applied for a job at a mysterious "Sunday convenience store" to make a living. A strange work card that can automatically generate an avatar becomes the key to connect two time and space - she accidentally travels to Gu Shuyao, the daughter of a wealthy businessman in the south of the Yangtze River in 1925, an orphan whose mother died young, her inheritance was coveted, and her life experience is a mystery.
During the day, she is the heir to the deep house of the Republic of China. Faced with the hypocritical second concubine, the playboy sister-in-law, and the "uncle" who smuggles arms, she uses modern wisdom to survive by dealing with strange items exchanged in the convenience store system. At night, she returned to the modern convenience store, and with the help of historical data and the help of her best friends, she learned about the conspiracy in advance: arson, bail fraud, and even... Shocking secrets involving the Japanese spy organization "Bamboo Agency".
Forced by the difference in speed between the two time and space (1 hour in reality = 1 day in the Republic of China), Gu Shuyao must outsmart the house wolf within a limited time, uncover the truth about the death of her biological mother, protect the country's industry, and in the undercurrent of national peril, join hands with the unpredictable and cold Major General Huo Yanchuan to fight against internal and external enemies.
When the convenience store system continues to release dangerous missions, and when the boundaries between the Republic of China and reality gradually blur, can she reverse her destiny in her double life and solve the ultimate mystery behind "Sunday Convenience Store" that transcends time and space?
