The series tells the story of Oh Ha-rin, who travels to the past through mysterious photos left by her first love, Ji Seo-jun. Since they were eight years old, they had been close friends, but he died by suicide on her birthday ten years ago.
Blue Birthday (2021)
Her first love passed away on her birthday
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YERI
Oh Ha-rin (16 episodes)
Yang Hong-seok
Ji Seo-jun (16 episodes)
Lee Sang-jun
Cha Eun-seong (16 episodes)
Kim Gyeol-yu
Do Su-jin (16 episodes)
Ju Hyeon
Kim Ui-yeong (16 episodes)
Kim Yi-seo
Ji Hye-min (12 episodes)
Lee Dong-ju
Kim Sin-u (5 episodes)
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