The Wonder Years (2007)

13-year-old Soo-ah lives with her widowed mother, who since her husband's death has been supporting them by running a diner and is always too busy for Soo-ah, who retreats into believing that a popular singer is her real mother; she watches the singer's music videos and daydreams about the star being her real mother. One day, Soo-ah decides to leave home and go to Seoul for the singer's concert, so she gets on the train with a friend and they land in Seoul. But Soo-ah has no money for concert tickets, so they wait at the back door until the show ends. Soo-ah hesitantly approaches the star--what will happen?