In an advanced city, a little girl named Mi Su has an organic life with her parents. Until, after a dispute between them, his father leaves the family. A few years later, her mother is also far behind him by buying a few advanced robots known as “Q-Bot”. “Mi Su”, which has once been single, has spent most of its time with robots now occupying the city from police to teachers. Years later, Mi Su has become an adult teenage girl, and her mother is completely unaware of her daughter's feelings. Until one day, he encounters the most advanced robot of the city called “7723”, and the strange friendship between them is formed.