For Korea
Immigration: https://www.hikorea.go.kr/Main.pt
Tax: http://wwhttps://www.hikorea.go.kr/pt/main_en.pw.nts.go.kr/eng/
Health insurance: http://www.nhis.or.kr/static/html/wbd/g/a/wbdga0101.html
Pension: http://www.nps.or.kr/jsppage/english/main.jsp
Support Center for Foreign worker: http://migrantok.org/english/portal.php
News: http://www.koreaherald.com
TV: http://www.arirang.co.kr/index.asp
Transportation: https://english.visitkorea.or.kr/enu/TRP/TRP_MAIN.jsp
Labor board: http://www.moel.go.kr/english/contac/contacCon.jsp
Police: https://www.police.go.kr/eng/main/contents.do?menuNo=500139
For China
Immigration: http://www.visaforchina.org/
Tax: http://www.chinatax.gov.cn/eng/
News: https://www.theguardian.com/world/china
Transportation: https://www.travelchinaguide.com/essential/transportation.htm
Cost of living calculator: https://www.expatistan.com/cost-of-living