Yoon

Yoon, born Shim Ja-yoon on April 14, 2004, is a South Korean singer and the lead vocalist of the K-pop girl group STAYC. Since debuting in November 2020, she has become known for her clear, powerful vocals and bright stage presence, helping to define the group's teen-crush concept. As the youngest member, or maknae, Yoon brings a youthful energy that resonates with fans and complements the group's dynamic sound.

STAYC, formed by producers Black Eyed Pilseung, quickly rose to prominence with hits like So Bad and ASAP. Yoon's vocal contributions have been central to the group's success, with her parts often highlighting her range and control. As of 2026, STAYC continues to release music and tour internationally, with Yoon solidifying her role as a key figure in fourth-generation K-pop.[edit]

Yoon was born Shim Ja-yoon on April 14, 2004, in South Korea. Details about her early childhood remain largely private, but her path to the entertainment industry began when she was scouted by High Up Entertainment. She then underwent a period of rigorous training, honing her singing and dancing skills in preparation for debut.

A pivotal moment came when she was selected as a member of STAYC, a group that was highly anticipated even before its official launch. Yoon's training focused on vocal technique and stage performance, and she developed a reputation among trainers for her dedication and natural talent. Before debut, she also attended Hanlim Arts High School, a prestigious performing arts school that has produced many K-pop idols. She graduated in February 2023, balancing her education with her budding career.[edit]

Yoon debuted as a member of STAYC on November 12, 2020, with the single album Star To A Young Culture and its title track So Bad. The song earned attention for its polished production and strong vocals, with Yoon's parts showcasing her clear tone. The group's follow-up single ASAP in 2021 became a sleeper hit, propelling STAYC into the spotlight and establishing their teen-crush image.

Over the next few years, STAYC released a series of successful mini-albums: Stereotype (2021), Young-Luv.com (2022), We Need Love (2022), Teenz Alpha (2023), and Metamorfosis (2024). Each release featured title tracks like RUN2U, Beautiful Monster, Teddy Bear, and Super Nova, which charted well on Korean music platforms. Yoon's vocal performances on these tracks have been consistently praised, with her ability to convey emotion and power earning her recognition as one of the standout vocalists of her generation. Beyond group activities, she has participated in variety shows and fan events, further building her individual profile.[edit]

Yoon is recognized for her youthful, energetic, and charming stage presence. Her signature aesthetic often aligns with STAYC's teen-crush and vibrant concepts, featuring bright colors and trendy fashion. Media portrayals focus on her role as a talented vocalist and the endearing maknae. The official fandom name for STAYC is SWITH, and fan culture involves enthusiastic support for group releases and appreciation for the members' individual personalities. Yoon's social media presence, primarily through STAYC's official accounts, reflects her bubbly personality and close bond with groupmates.[edit]

The SWITH community stands apart in the fourth generation of K-pop for its highly organized, aggressive streaming campaigns and coordinated physical marketing efforts that have redefined how fanbases support group comebacks. Within this collective, Yoon has cultivated a distinct relationship characterized by viral vocal highlights and the affectionate "Yoon-nal" nickname used in fan-made content to celebrate her specific contributions. Her interactions range from behind-the-scenes reflections on her official Instagram to charity drives organized annually on her birthday, creating a supportive ecosystem focused on her artistic growth rather than controversy. The fandom's energy was particularly visible during her viral cover of Avril Lavigne's "Sk8er Boi," which sparked a wave of reaction videos and cemented her reputation as a versatile artist capable of transcending STAYC's polished pop sound. More recently, her successful pivot to acting in projects like *Office Workers 2* and the lead role in *Death of Love* has expanded her reach beyond music, drawing media attention from outlets like *Chosun* and *MK*. Despite these individual achievements and the intense devotion of SWITHs, iFANN's Global Fame Engine has evaluated Yoon but she does not currently hold a placement in the published rankings (Global Top 1,000 or a Top-100 scope list). The fanbase has no formal name documented in IFANN data.[edit]

Yoon graduated from Hanlim Arts High School in 2023 alongside other K-pop idols and frequently cites IU as a source of inspiration for her vocal development. Known as the group's mood-maker, she often engages in playful banter with fans during live streams while maintaining her role as the clear-toned lead vocalist. A defining moment in her personal lore occurred in March 2022 when a fresh, short hairstyle she debuted stunned netizens and solidified her status as a top visual of her generation. Fans widely retell the story of her January 2023 cover of Avril Lavigne's "Sk8er Boi" as a legendary display of raw talent that resonated across age groups. Another well-documented chapter involves her COVID-19 isolation in March 2022, where she continued to support the group remotely despite testing positive while her members remained negative. Her recent acting career has become central to her narrative, highlighted by her lead role in the short drama *Death of Love* following her praised performance in *Office Workers 2*. These milestones combine to create a modern mythology of an all-rounder idol who successfully transitions between music and screen.[edit]

Yoon keeps her family life private, and specific details about her parents or siblings have not been publicly disclosed. She has not shared whether she has any pets. As of 2026, she lives with her fellow STAYC members in shared dormitory accommodations provided by High Up Entertainment, a common arrangement for K-pop groups during their active years.[edit]

Yoon is most closely associated with her STAYC groupmates: Sumin, Sieun, ISA, Seeun, and J. The group was formed by the production duo Black Eyed Pilseung, who have written and produced many of STAYC's hits. Yoon has also crossed paths with other K-pop idols through variety shows and music programs, though her professional network remains largely within the High Up Entertainment fold.[edit]

As of 2026, Yoon has not publicly confirmed any romantic relationships. Like many K-pop idols, she maintains privacy regarding her personal life, and no credible reports of past or current dating have emerged. Her focus remains on her career with STAYC, and fans generally respect her private boundaries. She is currently reported as single.[edit]

Per iFANN's editorial analysis, Yoon's net worth is estimated at $3 million as of 2026. This figure reflects her primary income streams derived from activities with STAYC, including album sales, digital streaming revenue, concert tours, and brand endorsements. The group has secured lucrative deals with major brands such as KFC Korea and various cosmetics lines, which contribute significantly to the members' earnings. Beyond music, Yoon generates additional revenue through appearance fees on variety shows and exclusive fan events. Individual net worth figures for K-pop idols remain speculative due to a lack of public disclosure regarding private contracts, but this estimate represents the current assessment of her financial standing.[edit]