What advice would you give to a foreigner coming to Korea for the first time?

From old times, it is very important in Korea to think abour manners.

So, when you come to Korea, If you wanted to using Korean, I prefer to it you have a talked after initiate a conversation with '~요' better than talk down to everyone.

And, I recommend. you come to Kora, during your trip, you can speak Korea ordinary language.

For example, '고맙습니다, 안녕하세요, etc'.

So, it is the better than your mother language.

If you take my advice, I think it your Korean travel is very good travel.

I add to my opnion, when you come to Korea, you have a number of Korean police(112) or Korean ambulance(119) or Korean goverment office.

Because you suddenly need the number.