TAX
You will get a Allien registration in Korea, the double taxation rules with most European Countries and Korea demand that you have less then 180 days in your "home" country.
To play it safe register at your Embassy in Seoul and if there are any doubts tell your the People at the Tax-Office to inquire at the Embassy how long you are there and so on.... it worked for me so far for a while. Your get 132 days per Year at home so, 365-132= 233 days out of your Residence Country, Source of income= Korea, Tax paid in Korea= No Tax in most EU-countries with double taxation agreement.
Carefull for all those who join the "Home base Programm" that can backfire if you send too much time at your base.
There is no need to pay off shore for Tax purposes but some claim they still have to do it, maybe one of the 3 Ex-Wife´s is behind his account..... Who knows.
Fly safe and land happy
NG