Hannah, a 10-year-old girl who is disappointed with her family, meets 9-year-old Youmei and 7-year-old Youzhen, whose parents work away from home for a long time. The three little girls rely on each other and rebuild their small "home". In order to save each other's families, they decide to embark on an unknown journey. Yun Jiaen, a Korean female director who is good at depicting delicate stories of girls, has another masterpiece after "Our World". She uses a very loving insight to show the complex and subtle emotions between children, giving adults a different inspiration.