He has collaborated with artists such as Suran, Lee So-ra, Halsey, IU, Max, Juice Wrld, and Psy.

He has since written and performed four other solo songs in the band's discography: "Intro: Never Mind" from The Most Beautiful Moment in Life, Pt.

The rapper continued working on solo music in between band-related commitments, ultimately developing the alter ego "Agust D" (derived from the initials DT, short for his birthplace Daegu Town, and "Suga" spelled backwards) as a medium for releasing music that did not have to take charts or trends into consideration.

His first mixtape, the eponymous Agust D (2016), featured an angrier, more aggressive sound and style in comparison to his usual work for BTS.

In April 2023, Suga released his debut solo studio album D-Day as Agust D. Described as the third and possibly final installment in his Agust D trilogy of works,[3] the record featured collaborations with BTS bandmate J-Hope, South Korean vocalist IU, Japanese composer Ryuichi Sakamoto, and indie rock singer Woosung of The Rose.