Hi,
this is the real guy living in Korea. Above all, you gotta have to be careful because out there in Korea, you would be facing gigantic competitors like Coupang(Korean Amazon), SSG, Lotte, E-mart, etc. Plus, if you have all your items in Euros, then the Koreans would be bouncing out right away because no one wants to calculate their final prices by themselves. (I even am facing the same issue because my shop offers items in Euros but wondering why 50% of the traffic is from USA and they bounce out within a few seconds..)
You need to consider Thailand first, because normally Koreans do not use Google for searching online malls because we have a better alternative, Naver. When your mall is more popular then think about Korea. You need to take this opinion serious because this is why I don’t open my business in my country.