Seoul Subway Line 3 of the Seoul Metropolitan Subway is a rapid transit service that connects Eunpyeong District to Gangnam and southeastern Seoul. Most trains head further northwest to serve Goyang via the Ilsan Line. In 2021, the Seoul Metro operated section had an annual ridership of 295,930,000 or 810,767 passengers per day.

Seoul Subway Line 8 of the Seoul Metropolitan Subway was built from 1990 to 1999 and mainly serves the southeastern parts of Seoul and Seongnam. The first section from Jamsil to Moran opened in 1996, and the second section from Moran to Amsa was opened in July 1999. The line color is rose. In 2019, Line 8 had an annual ridership of 112 million or about 307,000 people per day. At 17.7 km (11.0 mi) in length, Line 8 is the shortest of all heavy rail Seoul Metropolitan Subway lines.