Born on May 3, 2011, he made his acting debut at the age of 6 in the 2017 drama series Voice as the character "Hwang Ji Uk." A successful actor, he has appeared in popular productions such as Vigilante, Juvenile Justice, The Night Owl, Tale of the Nine-Tailed, and Queen of Tears. As of January 2026, he has acted in a total of 9 films and 34 dramas. Thanks to his successful performances in Queen of Tears and My Sweet Mobster, he won the Best Child Actor award at the APAN Star Awards in 2024. Currently attending Balsan Middle School, a public school in Goyang, Seoul, Lee Joo-won continues to actively pursue acting.