Korean language and culture: 

Online dictionary
http://www.zkorean.com/dictionary

Korean language learning
http://www.korean-language.org/
http://www.lifeinkorea.com/language/korean.cfm
http://www.learnkoreanlanguage.com/

Tourism
http://english.visitkorea.or.kr/enu/index.kto


Official websites

Republic of Korea (ROK) (South Korea)
http://www.korea.net/korea/korea.asp

Consulate of the Republic of Korea in Hong Kong 
http://hkg.mofat.go.kr/eng/as/hkg/main/index.jsp

Democratic People’s Republic of Korea (DPRK) (North Korea)
http://www.korea-dpr.com/

Consulate of the Democratic People’s Republic of Korea in Hong Kong
http://info.hktdc.com/vod/visa_nkorea.htm