In 2019, he debuted as a member of the South Korean supergroup SuperM, a joint project under SM Entertainment and Capitol Records.

[3] In 2012, Taeyong was scouted on the street by an SM Entertainment recruiter and joined the company after successfully passing the audition by singing the South Korean national anthem.

[6][7] In July 2014, a video of Taeyong performing part of his song "Open the Door" was published on SMTown's YouTube channel.

[19] He worked with singer and producer Yoo Young-jin on the rock ballad "Cure", which was released in August 2017, also through SM Station.

[20] Together with NCT 127's vocalists Taeil and Doyoung, Taeyong appeared on the soundtrack for the drama School 2017, featuring as rapper in and songwriter for the R&B ballad "Stay in My Life".

[28] On August 8, 2019, Taeyong was revealed as a member of SuperM, a K-pop supergroup created by SM Entertainment in collaboration with Capitol Records.

[33] It was commercially successful and debuted at number five on the US Billboard 200, selling more than one million copies in South Korea together with its repackage, Neo Zone: The Final Round.

[37] In March 2021, Taeyong started his own SoundCloud account and released a self-written demo single "Dark Clouds" and its remix.

[39] Taeyong served as a judge on Korean dance survival reality show Street Woman Fighter in August the same year, which gained significant popularity nationwide.

[40] He later appeared as a guest judge on the program's spin-off, Street Dance Girls Fighter, together with fellow NCT member Mark.

[40] He was credited as a choreographer and lyricist on the special album 2021 Winter SM Town: SMCU Express, having worked on the track "Zoo".

[42] Taeyong later announced the opening of his YouTube channel TY Track,[43] where he then released performance videos throughout the year for his song "Lonely" featuring Suran and "Ghost".

[44] On April 14, Taeyong released his official second single "Love Theory" in collaboration with Wonstein through SM Station, in which he participated in the songwriting.

[46] Taeyong made his official debut as a solo artist with his EP Shalala in June 2023, making him the first soloist of his group NCT.