The musical Subway Line No. 1 (지하철 1호선) is a Korean adaptation of the German original Linie 1, created by Volker Ludwig in 1986. Volker Ludwig, who visited Korea in May 1995, described the work as a "musical revue," blending revue theater and cabaret styles. Revue theater uses music, dance, mime, and satire to link loosely connected scenes, while cabaret, originating in 1920s Berlin, critiques social and political issues through music and improvisation.

The first Korean performance of Subway Line No. 1 was in 1994, and it was later adapted, directed, and staged by Kim Min-ki at Daehakro's Hakchon Theater from 1991 to 2008. The production became a cultural landmark, surpassing 1,000 performances by 2000. Volker Ludwig and Heye Heiman recognized the creative excellence of Kim’s version and waived royalties from January 1, 2000. The adaptation also received international acclaim, with performances in Germany, China, and Japan.

The Korean version reflects the social realities of 1990s Seoul, following a young woman from Yanbian searching for her lost lover. Along her journey through Seoul, she encounters diverse characters, including street vendors, gangsters, and runaways. With over 80 roles played by a small cast, the production is noted for its satire, humor, and dynamic performances, capturing the struggles and vibrancy of urban life.