Woozi

Lee Ji-hoon, known professionally by his stage name Woozi, is a South Korean singer, songwriter, and record producer managed by Pledis Entertainment. Born on November 22, 1996, he is best known as a member of the South Korean boy band Seventeen, serving as the leader of the group's vocal team and as part of its sub-unit Hoshi X Woozi.

From a young age, Woozi studied classical music and trained in playing the clarinet alongside other band instruments. After successfully auditioning for Pledis Entertainment, he met labelmate Bumzu, who became a frequent music production collaborator. Woozi graduated from Hanlim Multi Art School and subsequently enrolled in Hanyang University. In 2022, he enrolled in a Master's degree program at Anyang University.

Woozi officially debuted as a member of Seventeen on May 26, 2015, with the release of the single "Adore U." He helped write and produce every track on the group's debut extended play, 17 Carat. Over time, he established himself alongside Bumzu as Seventeen's main producer, and as of January 2019, he was credited with writing over 80 percent of the band's discography.

Beyond his work with Seventeen, Woozi expanded his musical output by writing for other K-pop acts. In 2016, he and Ailee wrote lyrics for her collaboration with Eric Nam titled "Feelin'." In 2017, he wrote the praised final single released by the project group I.O.I, titled "Downpour." That same year, he gifted the song "Thankful for You" to Baekho of NU'EST W for the group's EP W, Here. Woozi became a full member of the Korea Music Copyright Association in 2019 and released the song "Miracle" for the soundtrack of the television series The Tale of Nokdu in October 2019.

In 2021, Woozi collaborated on fellow Seventeen member Hoshi's song "Spider," which debuted at number five on the Billboard World Digital Song Sales chart. Later that year, he won Best Producer at the 6th Asia Artist Awards, becoming the youngest recipient of the award in the show's history. Woozi made his solo debut on January 3, 2022, with the mixtape Ruby. Its lead single was written entirely in English and reached number one on iTunes charts in at least 18 regions, including Chile, Mexico, Indonesia, and the Philippines. On January 26, 2024, he released the song "What Kind of Future" as a birthday gift to his late friend Moonbin.

In February 2025, Pledis Entertainment announced Woozi's debut in the sub-unit Hoshi X Woozi, which released the single album Beam on March 10. Outside of music, fashion brand Romantic Crown selected Woozi as a brand model for their 2022 Fall/Winter collection in October 2022 and collaborated with him again in March 2023 on a collection referencing "Universe Factory," the nickname for his music studio. On September 15, 2025, Woozi commenced his mandatory military service in the South Korean military as an active duty soldier.