Seoul Subway Line 5 of the Seoul Metropolitan Rapid Transit Corporation, dubbed the purple line, is a long line crossing from the west to the east across the Seoul National Capital Area, South Korea. Line 5 holds the distinction of being one of the two subway lines in Seoul to cross under the Han River (the other being Bundang Line), which is done at two points (between Mapo–Yeouinaru and Gwangnaru–Cheonho).