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Kim Ye-rim
- Oh Ha Rin
- (as Ye-rim Kim)
Yang Hong-Seok
- Ji Seo Jun
- (as Hong-Seok Yang)
Moon Joo-won
- Ji Seo Jun [Young]
- (as Moon Joo Won)
Song Min-hyung
- [Photo Shop owner]
- (as Min-Hyung Song)
Lee Sangjun
- Cha Eun Seong
- (as Lee Sang-Jun)
- Director
- Writers
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- Production, box office & more at IMDbPro
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![Kim Ye-rim and Yang Hong-Seok in Blue Birthday (2021)](https://m.media-amazon.com/images/M/MV5BNDRlZTI0ZjAtMzgyYy00Y2I5LWIzZDAtOWY5YTY0NzVmOGE0XkEyXkFqcGdeQXVyNDY5MjMyNTg@._V1_QL75_UY133_CR2,0,90,133_.jpg)