The Sillim Line (Korean: 신림선; Hanja: 新林線) is a light metro which is part of the Seoul Metropolitan Subway.

A northern extension towards Dongyeouido (station name is not determined yet) is currently being considered to provide transfers to Seobu Line.

[3] A five-station branch line from Boramae Park is also currently being considered.

[4] Citizens of Geumcheon District have lobbied for a further extension of the branch to Geumcheon-gu Office station.

A two-station southern extension of the line into the Seoul National University campus was considered but ultimately cancelled.