Yeonjun, officially stylized as YEONJUN, debuted as the oldest member of boy group Tomorrow X Together in March 2019 through the EP “The Dream Chapter: Star.” Yeonjun is an all-rounder: he can dance, sing, rap and produce songs. Some songs in which he is included as a composer or lyricist are Tomorrow X Together’s “Maze in the Mirror,” (2020), "MOA Diary (Dubaddu Wari Wari)," (2021), “LO$ER=LO♡ER,” (2021) and one of its latest song “Good Boy Gone Bad,” (2022). Yeonjun has also collaborated with other artists and featured on their songs, like in boy band Enhypen’s “Blockbuster,” (2021) and American singer Salem Ilese’s “PS5,” (2022). Currently, he is one of the hosts for SBS’s weekly music ranking show “Inkigayo” (2022-).