Oh Eun-seo

Oh was born on October 28, 2017, in South Korea.^[1] She showed an early interest in the performing arts, which led to her debut as a child model before transitioning into professional acting at the age of four.^{[citation needed]}

Oh began her professional acting career in 2021 with a guest appearance in the second season of the tvN medical drama Hospital Playlist Season 2, where she played a child patient within the pediatric ward. In early 2022, she gained national visibility as a series regular on the KBS2 music variety program Baby Singer. The program, commissioned to celebrate the 100th anniversary of Children's Day in South Korea, paired child performers with musical producers like Jung Jae-hyung to create contemporary children's songs. Her participation involved several televised ensemble performances and the recording of original tracks for the project's digital soundtrack.^[2]

In late 2022, Oh appeared in the tvN romantic comedy Love in Contract, portraying the childhood counterpart of a supporting character to establish their developmental backstory.^[3] This was followed by a recurring role in the KBS2 weekend drama Red Balloon, where she played the daughter of a supporting protagonist, appearing in several sequences to illustrate the family's internal conflicts.^[4] She made her feature film debut in the horror production Devil in the Lake (also released as Gwi-mot) in December 2022.^{[citation needed]} Portraying Ahn Da-jung, her character moves to a mansion near a reservoir with her mother (played by Park Ha-na), where her character's sensitivity to supernatural elements serves as the primary catalyst for the film's early narrative tension.^[5]

In 2023, she appeared in the screen-life romantic comedy film Long D in a supporting capacity. In television, she was cast as the childhood version of lead characters in the TVING thriller A Bloody Lucky Day and the tvN fantasy-romance My Lovely Liar. In both series, her scenes provided specific flashback context regarding the adult protagonists' childhood motivations and formative traumatic events.^{[citation needed]}

During 2024, Oh’s work focused on portraying the childhood versions of female protagonists in high-viewership dramas. In the tvN series Love Next Door, she played the young Bae Seok-ryu (adult version played by Jung So-min), depicting the character's early academic competition and relationship with the male lead.^{[citation needed]} This was followed by her role in the JTBC drama Family by Choice as the young Yoon Joo-won (adult version played by Jung Chae-yeon), where she portrayed the character's upbringing in a non-traditional family alongside two non-biological brothers.^[6]

In the KBS2 thriller Perfect Family, directed by Isao Yukisada, Oh played the childhood version of Choi Sun-hee (adult version played by Park Ju-hyun). Her role established the character's history as an orphan and her subsequent adoption, which served as a central mystery of the series.^[7] For this performance, she received a nomination for Best Child Actress at the 2024 APAN Star Awards.^[8]

Her other 2024 credits included guest appearances in Netflix's The 8 Show and Hellbound Season 2, where she played the younger versions of key characters in psychological flashback sequences. She also appeared in the tvN series Marry My Husband as the young version of a lead character and the JTBC series Frankly Speaking, with each role providing historical context for the main cast's development.^{[citation needed]}

In August 2025, Oh signed an exclusive management contract with Saram Entertainment, a talent agency representing actors such as Cho Jin-woong and Honey Lee.^[9][10][11] Following this transition, her roles expanded into more complex supporting characters. In early 2025, she appeared in the thriller Friendly Rivalry as the young Yoo Jae-yi, portraying the early signs of the character's calculated personality. She also appeared in the historical drama The Haunted Palace (Gwi-gung), playing the young Yeo-ri, a role that required the depiction of traditional court etiquette.^{[citation needed]}

Later in 2025, she portrayed the young versions of lead characters in the romantic series Would You Marry Me? and Motel California.^{[citation needed]} In the latter, she played the young Ji Kang-hee (adult version played by Lee Se-young), focusing on the character's upbringing in a rural motel. She concluded the year with a supporting role in the JTBC drama A Hundred Memories, which finished airing in January 2026. She played Se-ri, the younger sister of Jae-pil (played by Heo Nam-joon), in a role that featured a subplot regarding the character's first romantic interest. Following the series finale, she released a handwritten letter reflecting on the character's development and her time on the production.^[12]

In late 2025, Oh participated in the "Hug & Hub" social contribution project, an initiative aimed at raising awareness for pet welfare. She collaborated with actor Seo Ji-seok on the duet single "Silver Gungdi Pang" (실룩실룩 궁디팡팡), which was released on music platforms on December 19, 2025.^[13] The song, produced by Arthur and partnered with the pet care platform Intopet, describes the relationship between a pet and its owner.^[14]

The project included a charitable component where social media "reels" using the song's audio triggered donations of animal feed to the non-profit organization LCKD to assist abandoned animals.^[15]