*re-uploaded after some edits*

links to the things I mentioned:

- power adapters:
http://browse.gmarket.co.kr/search?ke...
also check daiso!

- deodorant:
https://www.oliveyoung.co.kr/store/di...
https://www.coupang.com/np/search?q=데...

- razors:
https://www.oliveyoung.co.kr/store/go...
https://www.oliveyoung.co.kr/store/go...

- big towels:
check Costco, Home plus, E-mart
https://www.coupang.com/np/search?q=대...
http://browse.gmarket.co.kr/search?ke...

- OTC meds:
   • Video  

- transport card:
https://english.visitkorea.or.kr/enu/...
https://www.t-money.co.kr/ncs/pct/tmn...

- SIM card:
https://www.trazy.com/experience/deta... (ships to your house before you leave)
https://www.trazy.com/experience/deta... (airport pick-up)

- online shopping without ARC:
https://www.gmarket.co.kr

APPS

- Naver maps:
https://m.map.naver.com (app works better than website)

- Kakao taxi

- Papago:
https://papago.naver.com

- Naver dictionary:
https://en.dict.naver.com/#/main

- Kakao talk

- Kakao metro

- Yogiyo:
https://apps.apple.com/us/app/배달요기요-기...

- Baemin:
https://apps.apple.com/us/app/배달의민족/i...