Lee Jae-in (; born February 6, 2004) is a South Korean actress. She first gained recognition through the mystery film Svaha: The Sixth Finger (2019). Other notable works include Racket Boys (2021) and Hi-Five (2025).
Career Lee Jae-in is one of the few South Korean celebrities born in Gangwon, a border province with North Korea. Lee debuted in 2012 as the child counterpart of a supporting character in Ice Adonis.
Her first prominent casting was for 2019 religious mystery film Svaha: The Sixth Finger. Her portrayal of two different twin girls earned her various wins and nominations from major film awards. The same year, Lee also played her first regular role in television series with JTBC's Beautiful World.
In 2021 Lee was cast in JTBC's legal espionage series Undercover and SBS' sport drama Racket Boys as a national youth badminton team's ace athlete. The same year she got praised for her role in the ticking clock-thriller film Hard Hit.
In January 2023, Lee signed with Yooborn Company.
At the age of 21, Lee got nominated for Best Actress at the prestigious 2025 46th Blue Dragon Film Awards for her role as a young girl with superpowers in the action fantasy Hi-Five, the second-youngest nominee for the category after Jun Ji-hyun in 2001.
In 2026, Lee joined the cast of tvN's slice-of-life romance series Spring Fever.
Filmography Film Year Title Role Notes 2013 Happiness for Sale 2014 No Tears for the Dead Daeban granddaughter Futureless Things 2015 School 2015 Ra-Jin 2016 Horror Stories 3 Machine Ghost Dunko 2017 I Can Speak Jung-shim (young) Tombstone Refugee Da-bin Survival Guide Older Sister 2018 At Her Own Pace Woo-ju Adulthood Hwang Kyung-eon Our Body Yoon Hwa-young 2019 Svaha: The Sixth Finger Lee Geum-hwa / "It" The Battle: Roar to Victory Choon-hee 2021 Hard Hit Lee Hye-in Heaven: To the Land of Happiness TBA 2025 Hi-Five Park Wan-seo Concrete Market Hee-ro
Television series Year Title Role Notes 2012 Ice Adonis Ha Yoon-hee (young) Quiz from God 3 Ha-young 2012–2013 Family Da-young 2013 Samsaengi Jung Yoon-hee (young) 2014 Modern Farmer Min Gi's little sister Cameo KBS Drama Special:"The Last Puzzle" So Hee 2015 Who Are You: School 2015 Ra-jin Sense 8 Season 1 Seon (young) Cameo 2015–2016 Six Flying Dragons 2017 Sense 8 Season 2 Seon (young) Cameo 2018 Drama Stage:"Slide to Unlock" Yeo-na 2019 Beautiful World Han Dong-hee 2020 Hospital Playlist So-mi Cameo (Episode 11) 2021 Undercover Han Seung-mi Racket Boys Han Se-yoon 2022 O'PENing:"The First Glance" Yoon-jae one act-drama; season 5 2023 Night Has Come Lee Yoon-seo 2025 Our Unwritten Seoul teen Yoo Mi-ji / Yoo Mi-rae Concrete Market Choi Hee-ro The Price of Confession Koo Hui-yeong 2026 Spring Fever Choi Se-jin
Awards and nominations Award Year Category Nominee / Work Result Baeksang Arts Awards 2019 Best New Actress – Film Svaha: The Sixth Finger Blue Dragon Film Awards 2019 Best New Actress 2025 Best Actress Hi-Five Buil Film Awards 2019 Best New Actress Svaha: The Sixth Finger 2021 Best Supporting Actress Hard Hit Golden Cinema Film Festival 2019Best New Actress Svaha: The Sixth Finger Grand Bell Awards 2018 Best New Actress Adulthood 2020 Best New Actress Svaha: The Sixth Finger SBS Drama Awards 2021 Best Young Actress Racket Boys Wildflower Film Awards 2019 Best New Actress Adulthood
Listicles + Name of publisher, year listed, name of listicle, and placement Publisher Year Listicle Placement Korean Film Council 2021 Korean Actors 200
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