I attached update version of Seoul subway map that include Line 9.
I found PDF file of English and Chinese.
Whenever I find Japanese, I will attach it.
Reference Site
Seoul Metro : http://www.seoulmetro.co.kr/eng
Seoul Metropolitan Rapid Transit Corporation : http://www.smrt.co.kr/Eng/index.jsp
Updated Map 2010 year
English : https://lookatkorea.com/blog/korea/archives/seoul-subway-map-english-version/
Japanese : https://lookatkorea.com/blog/korea/archives/seoul-subway-map-japanese-version/
https://lookatkorea.com/blog/korea/archives/seoul-subway-map-chinese-version/
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