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Blue Birthday (블루버스데이) is an South Korean web series produced by Naver subsidiary PlayList Studio. It premiered on July 23 through Naver TV and WeTV and aired every Friday and Saturday at 19:00 (KST). It premiered on August 6 through YouTube for international audiences.


Oh Ha Rin (Yeri) revisits the past through mysterious photos left by her first love, Ji Seo Jun (Yang Hong Seok), who died on her birthday 10 years ago. She had resolved to confess to him on her birthday, but he ended up taking his own life, much to her shock and horror. Seo Jun was also about to confess his feelings to Ha Rin when he met his sudden death in the photography room.

Ha Rin currently works at an abandoned pet shelter, but on the 10th anniversary of the incident, she comes into possession of some photos that Seo Jun left behind. Ha Rin, whose painful memories were relighted again, decides to burn all the pictures. When she was burning the pictures, she suddenly realized she was back to the day she took the picture 10 years ago. The camera only has 8 pictures, so Ha Rin only has 8 chances to go back in time

Will Harin finally uncover all the hidden secrets from the past and be able to change what had already happened?


  • Yeri as Oh Ha Rin
    • Kim So Yoon as young Oh Ha Rin
Lost her first love 10 years ago and is currently working at an abandoned animal protection center. On the day of her 18th birthday she decided to confess her feelings to Seo Jun, but she finds him dead in the photo studio. Due to that, her life drastically changed, and endured times of great despair and hell.
  • Yang Hong Seok as Ji Seo Jun
    • Moon Joo Won as young Ji Seo Jun
Ha Rin's first love and the perfect example of a 'boyfriend'. He doesn't miss out on 1st place, the image of him being perfectly cheerful and kind, as with his good relationship with his schoolmates. He's able to fully show off his heart-throb charms, sometimes with a bright smile, sometimes with caring eyes, and sometimes with his energetic side. But, contrary to his bright appearance, he is a person that is gloomy inside and hides a lot of pain, but that does not open up to others about it. Ha Rin is the best friend who gave him hope for life. The day Ha Rin felt more than a friend to him, and tried to confess, he died in the photo studio where they had made happy memories together.

  • Lee Sang Jun as Cha Eun Seong.
A reporter from the social affairs department, who had a crush on Ha Rin in the past. He was born into a wealthy family and always has a positive mind.
  • Kim Gyeol Yu as Do Soo Jin.
    • Park So Jeong as young Do Soo Jin
Harin's best friend and roommate. She is a loving and kind person who cares about Ha Rin after Seojun's death.
  • Park Ju Hyeon as Kim Eui Yeong.
Soojin's boyfriend, who does everything for her.
  • Kim Yi Seo as Ji Hye Min.
    • Jeong Ye Dam as young Ji Hye Min.
Seojun's older sister. She runs a cafe and takes care of her younger brother and her parents, who are struggling after the sudden death of her brother.
  • Lee Dong Ju as Kim Shin U
A student who hated Ji Seo Jun. 10 years later, he works as a chemical medicine delivery agent to steal zoletil.

  • Song Min Hyung as the photo studio owner (Ep. 1 and 16)
  • Yoo Soo Bin as Senior at Seoyeon High School (Ep. 3)
  • Lee Byung Jae as the detective (Ep. 9)
  • Moon Sang Hoon as the Geography teacher


Name Artist Release Date Original Song by:
비가 오는 날엔(2021) (On Rainy Days) Heize (헤이즈) August 4, 2021, 16:00 KST B2ST/BEAST (비스트)
어떤 날도, 어떤 말도(2021) (Any day, any word) 03ohn (오존) August 17, 2021, 16:00 KST Lucia (심규선)
It's you Colde (콜드) August 24, 2021, 16:00 KST ---
It's you (cover) Yeri (예리) September 2, 2021 12:00 KST ---


*Some titles contain spoilers*

Episode TItle Thumnbail title Release Date
01 "The gift I received for my 18th birthday is the death of the person I like." "My first love died on my birthday" July 23, 2021
02 "I met my first love, who died 10 years ago." "I found a way to go to the past." July 24, 2021
03 "I saw the painful past of my friend who died 10 years ago." "I found out my boy-friend's secret." July 30, 2021
04 "Why are you not here by my side?" "What happens when you change the past recklessly" July 31, 2021
05 "Went on a date with my first love after 10 years." "My dead first love appeared." August 6, 2021
06 "Why did you hide this?" "My friend lied to me." August 7, 2021
07 "I need to find another way to bring my dead friend back to life." "I'll go further back from here." August 13, 2021
08 "Today I want to talk to you." "Confessing the secrets of the past." August 14, 2021
09 " 'Were you the culprit?' " "I ran into the culprit who killed my first love." August 20, 2021
10 "Someone changed the past." "Another opportunity has come." August 21, 2021
11 "Where did you go alone?" "What are you hiding?" August 27, 2021
12 "We found conclusive evidence." "We found the criminal's mistake." August 28, 2021
13 "The price of changing the past has begun." "Bad luck has begun again." September 3, 2021
14 "This time, we must prevent the murder." "I came to the past with the murderer." September 4, 2021
15 "Everything is wrong." "My first love died because of me." September 10, 2021
16 "If I hadn't burned that picture..." "It was our choice, right?" September 11, 2021



The series was produced by Playlist, a production company known for producing several hit web drama for the 10s-20s generation, including the A-Teen, A-Teen 2 and Love Playlist series. Directed by Park Dan-hee and written by Goo So-yeon and Moon Won-young, it is a work that challenged new genres and materials by reuniting with the production team, who had gathered topics with ending series such as The Best Ending (2019) and Ending Again (2020).

Principal photography on the series wrapped in June 2021 after 3 months of filming. On June 23, the stills from filming of the series were released.


On March 30, 2021, Joy News24 announced that Kim Yerim and Yang Hongseok were in talks to star in the series. Following news reported the script reading held in Seoul on April 5, 2021, Hongseok and Yeri confirmed to be acting as the protagonist of the series. On May 14, rookie actor Lee Sangjun confirmed joining the cast and followed by Kim Gyeolyu on May 25.


Kim Yerim and Yang Hongseok appeared on SBS Power FM's Wendy's Young Street, Naver NOW's Seulgi.zip and KBS Cool FM's Kang Han-na's Volume Up on July 16, 20 and 21, respectively.


A teaser video was released on June 10 on the occasion of Ha Rin's birthday. The production team explained, "This video contains the meaning of 'Blue Birthday', the first love who chose death on the day of her birthday. Through the videos and images that will be released, the inner story will be revealed little by little." 'Blue Birthday' will be released on Naver TV on July 23rd, and on YouTube from August 6th.



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