"Seoul Metro Line9" . "Seoul Subway Line 9" . . "38" . . . "Operational" . "Line 9's" . "Metro 9 corporation" . "Seoul Subway Line 9" . . . . . . . . . "Seoul Metro 9" . . . . "2009" . "2009-07-24" . . . "9" . . "40600.0" . . . "Line 9" . "line 9" .