Jang Sung-yoon (장성윤) is a South Korean actress. She was born on 17th February 1998 in Seoul, South Korea. Jang pursued her passion for acting and media by graduating from the Department of Media, Film, and Advertising at Hansei University (한세대학교). Her academic background provided her with a solid foundation in storytelling and screen performance.

Jang Sung-yoon made her acting debut in 2018 with a role in the critically acclaimed JTBC drama SKY Castle (SKY 캐슬), where she quickly caught the attention of viewers and industry professionals with her natural acting and screen charisma. Her early breakthrough paved the way for more opportunities across television.

In 2022, she appeared in the SBS drama Today’s Webtoon, portraying a fresh and engaging character within the competitive world of digital publishing. The same year, she took on a darker role in Midnight Horror: Six Nights, showcasing her versatility in handling suspense and horror narratives.

Jang gained broader recognition in 2023 with her role in Bitch X Rich, a youth thriller series set in a high school with dark secrets and social tensions. Her performance added emotional complexity to the story, earning her praise and a growing fan base. She reprised her role in Bitch x Rich Season 2 (2025), further deepening her character’s arc.

In 2024, she starred in My Sweet Mobster, and in 2025, she appeared in the action-medical drama The Trauma Code: Heroes on Call, cementing her reputation as a rising actress with both talent and range. With each role, Jang Sung-yoon continues to impress audiences and solidify her place in the South Korean entertainment industry.