Blue Birthday

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.

YERI, Yang Hong-seok, Lee Sang-jun, Kim Gyeol-yu, Ju Hyeon. See the cast cards above for character names.

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