Prior to his debut as a member of Winner, Nam performed as a backup dancer for the YG Family Concert 2011.

He co-composed three songs from the album – "But" (사랑하지마), "Tonight" (이 밤) and his solo track "Confession" (고백하는거야).

[11][12] On October 12, YG Entertainment stated that Nam would be halting promotional activities and receiving treatment for mental health issues.

[14][15] The following day, he posted a handwritten letter on his personal Instagram account containing his apology, gratitude to fans and pledge to return with other music and projects.

On March 25, Nam, together with his rumored band, South Club, held a guerrilla show at Pet Sounds Bar in Korea.

[20] On April 11, Nam announced that his music label "South Buyers Club" has officially been registered as of March 30.

[22] South Club's first EP 90 was released on June 27, along with music videos for the two title tracks: "Liar" and "I got the Blues.".

[24] After the member Yooni's departure,[25] the band's first release as a four piece was the second single "누굴 위한 노래인가요 (Who Is This Song For?

Continuing his solo endeavors, Nam Tae-hyun released a new song titled "On the Edge of the Night" on January 17, 2025, along with a music video on his channel.

This transition into more individual projects and the release of new solo material signaled a new direction for Nam Tae-hyun's artistic career as he moved into 2025.

[27] He broadcast live on the Casper Radio Vlive channel on Mondays, at 11pm, to talk about various topics and to share his music with his fans.

He stated in a November 2018 interview with Rolling Stone India that while founding his label South Buyers Club took a toll to his emotional wellbeing that he hadn't recovered from at the time, his daily effort to stay productive helped him "overcome his [feeling of] loneliness and depression".