The film focuses on nostalgia and takes the audience to the 1980s in South Korea. The joys, sorrows and sincere friendship of the seven little girls will last them a lifetime. The English song "Sunny" is used as the theme song throughout, and it is even the title of the film. Using an old song to mark the film with the times is not only to evoke the audience's memories, but also to make this song a part of the film. A kind of spirit in , sunshine and laughter is the life purpose of the seven sisters, even in the face of great difficulties, even in death, there are smiles to welcome, this is the undefeated life. When they are young, most people will be accompanied by best friends. They don't miss the majestic days of the past, but they miss the joy of doing silly things together. Young and ignorant, but the memories of that time are the most precious in adulthood.
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