2001–2014: Debut as a child model and transition to acting Kim began her career in 2001, making her debut as a child model for a parenting magazine. Kim's first acting role was in the 2009 film
A Brand New Life, directed by the French-South Korean filmmaker
Ounie Lecomte and loosely based on her life. Kim played the main character, a nine-year-old girl named Jin-hee, who is abandoned by her father at an orphanage after he remarries, and is later adopted by a French couple. Kim attended the
Cannes Film Festival when the film was shown there in a special screening, becoming the youngest actress to be invited to the festival. She then co-starred with
Won Bin in
The Man from Nowhere, which was the highest-grossing film in South Korea in 2010. She played Jung So-mi, the daughter of a heroin addict who is kidnapped by an organized crime ring. During filming, she was only allowed to watch her own scenes on the monitor. along with a
Baeksang Arts Award nomination for
Best New Actress – Film. Her next role was in the drama film ''
, alongside her sister Ah-ron. The film is about international adoption, and was the first Korean film to win Best Film at the Giffoni International Film Festival in 2012. Kim then had a dual role in the thriller film The Neighbor'', playing a murder victim and the serial killer's next target. In a 2014 interview, Kim's manager said Kim had "a great eye for good scripts which made it possible for her to choose her own projects at a very young age". Kim also stated that she never had difficulty accepting difficult roles and was able to slowly immerse herself in the characters. Her first role of the year was in the documentary-drama film
Manshin: Ten Thousand Spirits, reenacting the teenage version of
shamanist Kim Geum-hwa. She then played a victim of bullying and domestic violence in the film
A Girl at My Door. She accepted the role because she liked the script and was attracted to the character. Kim attended the Cannes Film Festival for the second time when the film premiered there as an
Un Certain Regard official selection. Her performance was praised by critics—
Variety called it "mesmerizing" and
Twitch Film noted she had shown more layers and depth compared to her previous roles. She was nominated for many awards, winning Best New Actress at the
35th Blue Dragon Film Awards and
Golden Cinematography Awards. Also in 2014, she starred in the teen fantasy-romance television series
Hi! School: Love On as an angel who becomes human, and the thriller film
Manhole, playing a hearing impaired girl who is kidnapped by a serial killer.
2015–2021: Acclaim and transition to lead roles In 2015, Kim had a lead role in the
Drama City television special,
Snowy Road. The two-part drama series is about the "
comfort women" in
Korea under Japanese rule during World War II, and was later released as a film in theaters. Kim's performance as a 15-year-old comfort woman was praised by both critics and viewers, and she was awarded Best Actress in a Foreign Film at the
Golden Rooster and
Hundred Flowers Film Festival. She then played the main character in the television series
To Be Continued and the younger version of
Choi Kang-hee's character in
Glamorous Temptation. She was cast in her first adult role in the 2016 television drama series,
Secret Healer, playing a cursed
Joseon-era princess. In November 2016, Kim signed with
YG Entertainment. In 2018, Kim starred in the thriller film
The Villagers. She went on to star in the fourth season of the campus web drama
Love Playlist in 2019. The same year she starred in the thriller drama
Leverage, based on the
American drama of the same name. In November, it was reported that Kim's contract with YG Entertainment had expired, and that she would be leaving the company. In January 2020, Kim signed with
Gold Medalist along with actors
Kim Soo-hyun and
Seo Yea-ji. In May 2021, Kim was confirmed to take the female lead role in the 12-episode web series
The Great Shaman Ga Doo-shim, with
Nam Da-reum portraying the male main lead.
2022–2024: DUI incident, career plateau and comeback attempt In April 2022, she was cast in the
SBS drama
Trolley. On May 18, around 8:00 am, Kim was
driving under the influence in
Gangnam District, Seoul, when she crashed into several structures, including a transformer, guard rails and street trees. In the crash, the transformer malfunctioned, and electricity was interrupted for about three hours at 57 places, including nearby shops, causing damage to merchants. The following day, her agency,
Gold Medalist, released a statement saying that, "Kim Sae-ron is deeply reflecting on her apparent mistake. The damage caused by the crash is being compensated as much as possible. I will do my best to take responsibility until the end." On May 19, she left the
Trolley drama due to the charges. On May 23,
Netflix announced that it has decided not to shoot additional scenes with Kim in the series
Bloodhounds (2023). A Netflix representative stated that "the editing of Kim's existing scene is under discussion". In 2023, the series was released after a significant portion of Kim's scenes were edited out, with the storyline revised. In December 2022, Kim's contract with Gold Medalist expired. On April 17, 2024, it was announced that Kim would act in the upcoming play
Dong Chi Mee. This would be her first return to acting since the incident. On April 18, the organizers of the play announced that Kim was stepping down due to poor health issues.
2025: Posthumous releases Kim's last two films,
Guitar Man and
Urineun Maeil Maeil (Day by Day), are set to be released posthumously in 2025. Filming for
Guitar Man wrapped-up at the end of 2024 and was released in May 2025.
Urineun Maeil Maeil (Day by Day) was filmed in the latter half of 2021 and intended to be released in the first half of 2022. However, due to post-production difficulties, including Kim's drunk driving incident in May 2022, the film was shelved; it was initially planned to be released in South Korean cinemas in September 2025, though in May 2025 it was again delayed. ==Volunteer work==