Kim You-jung, born on September 22, 1999, is one of South Korea's most beloved actresses, having transitioned seamlessly from a celebrated child star to a leading lady in both television and film. She began her career at the tender age of four, modeling for a confectionery brand, and made her acting debut in 2003. Her natural talent and captivating screen presence quickly made her one of the most in-demand child actresses in the country, earning her the affectionate nickname "Nation's Little Sister." This early success laid a formidable foundation for a career that would see her become one of the most recognizable faces in Korean entertainment.

You-jung's breakthrough as a leading actress came with the 2016 historical romance Love in the Moonlight, where she starred opposite Park Bo-gum. The drama was a massive hit, catapulting her to widespread fame and cementing her status as a rising star. Her performance was so impactful that she ranked 8th on the Forbes Korea Power Celebrity list in 2017, making her the youngest person to ever crack the Top 10 at just 17 years old. Throughout her teens, she appeared in several acclaimed historical series, such as Moon Embracing the Sun and The King's Doctor, which led media outlets to dub her the "Sageuk Fairy" for her mastery of period roles.

In the years that followed, You-jung continued to diversify her impressive filmography with a range of genres. She drew significant attention for her leading role in the romantic comedy Backstreet Rookie in 2020, followed by the historical fantasy Lovers of the Red Sky in 2021, where she starred alongside Ahn Hyo-seop. Her performance in the 2022 teen romance film 20th Century Girl became a global sensation on Netflix, earning her the new nickname "Nation's First Love" and solidifying her appeal to an international audience. She then captivated viewers in the fantasy romance My Demon (2023–2024) opposite Song Kang, showcasing her range in a modern-day supernatural setting. Most recently, she took on a darker, more intense role in the 2025 psychological thriller Dear X, further proving her versatility as an actress.

From her early days as a child model to her current status as a top-tier leading actress, Kim You-jung's career is a testament to her enduring talent and hard work. With each project, she continues to challenge herself and earn the adoration of fans worldwide, solidifying her legacy as one of the most accomplished actresses of her generation.