Seoul Trail Course 3: Godeok - Iljasan/서울 둘레길 3코스 고덕 - 일자산코스 (Korea)
Point of departure: Seoul Subway Line 5, Gwangnaru Station, Exit 2
Point of arrival: Seoul Subway Line 3/Bundang Line, Suseo Station, Exit 5
(or you may run the other direction)
As per all sections along the Seoul trail, follow the orange ribbons, Seoul Trail signs, and floor markings. The course is really well marked.