Lee Leo (; born August 22, 2002), known mononymously as Leo, is an Australian singer based in South Korea. He made his solo debut with the single "One Look" on August 17, 2023, and with his first extended play (EP) Come Closer on May 9, 2024. He later competed on the survival program Boys II Planet, finished sixth, and debuted as leader of WakeOne's boy band Alpha Drive One in January 2026.
Lee Leo was born on August 22, 2002, in Sydney, Australia. He graduated from St Patrick's Marist College before moving to South Korea.
At 17, he moved from Australia to South Korea to pursue a career in music. Leo began training under Big Hit and was announced in March 2021 as a member of the preâÂÂdebut boy band Trainee A, alongside Lee Sang-won, James, Han Ji-hoon, Jo Woo-chan, Yorch, Justin Jay (JJ), Park JunâÂÂil, and Park InâÂÂhyuk. The first video uploaded to Trainee A's YouTube channel was a day in the life vlog in which Leo introduced himself. He later appeared in the music video for BTS's "Permission to Dance". Following lineup changes during 2022, Leo announced his departure from the project on August 25, 2022, thanking the company and apologizing to fellow members and fans. The Trainee A project ceased activities and was disbanded later that year.
After leaving Trainee A, Leo signed with 131 Label, the record company founded by singer, rapper, songwriter, record producer B.I. He made his solo debut on August 17, 2023 with the single "One Look", produced by American production team The Stereotypes and 9AM and featuring Destiny Rogers. He performed "One Look" at the KIIS FM KâÂÂPop Village during KCON LA 2023 at the Los Angeles Convention Center on August 19 as part of a global promotion with iHeartMedia, and released the song's music video, filmed in Los Angeles, on August 29, 2023.
He released his first EP, Come Closer, on May 9, 2024, featuring the tracks "Pretty Plzzz" featuring B.I, "Farewell" written by B.I and White Noise Club, and was produced in part by The Stereotypes and Bangs. He performed songs from the EP on KBS2's Music Bank and MBC's Show! Music Core, where he was praised his strong stage presence and performance. He competed in the 2024 Mnet rap competition Rap:Public as a member of Block 8, but his team was eliminated after a defeat by Block 6. He later teased a snippet of his new song through X(formerly Twitter) account on February 27th, 2025 named "Tenderly" and was officially released on February 28th, 2025 on all major music streaming platforms. He released this song and presented to his fans, Leoz as a letter with the quote in the youtube music video description "It won't be long until we meet again. Until then, this is everything I wanted you to hear. Let's meet soon." as a message of starting a new chapter.
After his solo debut, he entered the Mnetsurvival competition Boys II Planet. He contacted Lee Sang-won, former Trainee A teammate, who had then considered leaving the industry and was living a civilian life, to compete and debut together through the show. The two, who had previously signed with Grid Entertainment as a duo, appeared on the show under "Planet K" where they drew attention for their cover of Enhypen's "No Doubt". Throughout the competition, the pair consistently ranked near the top from their initial appearance through the final rounds. Thai singer Yorch, former member of Trainee A and current member and leader of Pow, described them as a motivating presence for their agency and fellow trainees after joining the company and participating on the show.
At the show's conclusion, Leo was announced as one of the eight finalists selected to sign with WakeOne and form the boy band Alpha Drive One. He finished the competition in sixth place and joined the group alongside the winners, Kim Jun-seo, Zhang Jiahao, Kim Geon-woo, Lee Sang-won, He Xin-long, Zhou An-xin, Chung Sang-hyeon. Leo was later announced as the leader of the group through Instagram live from Alpha Drive One official account on November 1st, 2025. Alpha Drive One debuted on January 12, 2026, with the EP Euphoria. Leo described the debut as a "new beginning" for him and said the EP captured the "euphoric moment" for its members.