3호선 버터플라이 has been played on NTS in shows including Posh Isolation, featured first on 2 December 2021. Songs played include 무언가 나의 곁에, 그림으로 가는 사람들 and 니가 더 섹시해 괜찮아 Utterly Sexy.

3rd Line Butterfly are a South Korean band formed in 1999. Currently the band is made up of the lead members 남상아/Nam Sang-ah (vocals, guitar), 성기완/Sung Gi-wan (vocals, guitar) and 김남윤/Kim Nam-yoon (bass guitar).

In 2000 they released their début album 'Self-Titled Obsession', while in 2002 they came to public attention when they were featured on the OST to the drama '네 멋대로 해라' ('Ruler of Your Own World').

2009 saw the 10th anniversary of their formation, while on the 19th of November of that year they released the 'Nine Days or a Million' EP, five years after their third studio album 'Time Table' (2004).

In 2010, they re-released remastered versions of their three albums as well as a boxset limited to 666 copies containing all three albums and a 64-page booklet.