Much of the film was shot in a housing complex in the Gangnam district built in the 1990s, which survived the rapid changes of Seoul only because redevelopment in the area had been put to a halt. It was demolished shortly after the shoot.
A line in the Eun Hee's letter to the teacher Young Ji "I want to be a cartoonist to comfort people." from the director Bora Kim's primary school diary.
The film serves as a sequel to Kim Bo-ra's short The Recorder Exam (2011), which follows a nine-year-old girl also named Eun-hee.