Celebrities become an Unnie (older sister) for a day to a younger celebrity spending 24 hours together, sharing one bed and one blanket.
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Last updated: June 9, 2026
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Secret Sister first aired in 2018. Moviely hosts cinematic wallpapers captured from the TV series's official backdrop imagery.
Secret Sister is categorized as Reality.
박소정 directed Secret Sister.
Secret Sister has a runtime of 50min.
Secret Sister has 1 season on record.
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