TFN (formerly known as T1419) is a South Korean–Japanese boy band formed in 2021 under MLD Entertainment. The group consists of nine members: Noa, Sian, Kevin, Gunwoo, Leo, On, Zero, Kairi and Kio. In addition to their music, TFN is also known for their positive message and their commitment to social justice, speaking out about a variety of issues, including mental health, bullying, and discrimination. The group debuted on January 11, 2021, with their single album Before Sunrise Part 1 proving to be a massive commercial success, debuting at number 1 on the Gaon Album Chart, with the album’s lead single, "Asurabalbalta," attaining similar success. The group recorded Parts 2, 3 and 4 throughout 2021, taking home the Potential Singer Award at both the 2021 and 2022 Asia Artist Awards, releasing their first Japanese mini album, OUR TEEN:BLUE SIDE in March. The album debuted at number 32 on the Oricon Album Chart with lead single, "Run Up," gaining considerable traction in Korea and Japan alike. In April 2023, TFN released their second Japanese mini album: OUR TEEN:YELLOW SIDE, peaking at number 47 featuring tracks such as "Mirage" and "jinjja!!". TFN disbanded on February 29, 2024.