On April 7, Playlist confirmed Red Velvet's Yeri and PENTAGON's Hongseok will be starring in their upcoming fantasy romance drama series 'Blue Birthday' which tells the story of Oh Ha Rin, who lost her first love, Seo Jun, to suicide on her birthday. 10 years later, she accidentally discovers a lost photo of him on her birthday, and revisits the past through this photo left by their first love.
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