Lia

Choi Ji-su, known professionally as Lia, is a South Korean singer. She is best known as a member of the South Korean girl group Itzy, which was formed by JYP Entertainment in 2019.

Lia was born on July 21, 2000, in Incheon, South Korea. During elementary school, she moved to Toronto, Canada. At age 14, she passed an audition for SM Entertainment but chose not to join following a disagreement with her parents. After returning to South Korea, she attended the North London Collegiate School Jeju. In 2017, she passed an audition for JYP Entertainment and underwent two years of training. She later graduated from the School of Performing Arts Seoul.

On February 12, 2019, Lia officially debuted as a member of Itzy with the release of their first single album, It'z Different, alongside the music video for its lead single, "Dalla Dalla". Beyond group activities, Lia has recorded music for several television soundtracks. In 2022, she released the solo song "Always Be Your Star" for the MBC series The Red Sleeve. Later that year, she recorded "Blue Flower" for the tvN drama Alchemy of Souls 2, which reached number 184 on the Circle Chart. She followed this on May 26, 2023, by releasing "One Hundred Love" for the soundtrack of Dr. Romantic.

In September 2023, JYP Entertainment announced that Lia would take a temporary hiatus to receive treatment for anxiety. During her break, she co-wrote and released the solo track "Blossom" with Sim Eun-ji. Dedicated to her fans, the song was featured as part of Itzy's solo performances on their EP Born to Be. In July 2024, JYP Entertainment announced that Lia would resume her activities with Itzy, beginning with a new album scheduled for the second half of that year. Also in 2024, she recorded the songs "Why Not" for SBS's The Fiery Priest 2 and "Woodahe" for JTBC's The Tale of Lady Ok.

In addition to her music career, Lia has engaged in fashion ventures and philanthropic work. In March 2023, she appeared in a solo pictorial and interview for Elle Korea, where she discussed her personal style, Itzy's identity, and her personal growth. In August 2022, she donated ₩30 million to The Hope Bridge National Disaster Relief Association to assist flood victims. In December 2023, she contributed another ₩30 million to the National Cancer Center Foundation to support pediatric cancer patients.