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You, and many other European nationals, are allowed in to Seoul (up to 90 days), according to Ministry of Foreign Affairs:
[Schengen countries (except for Slovenia out of the 26 Schengen countries)], Austria (Diplomatic/Official: 180 days), Belgium, Czech Republic, France, Germany, Greece, Hungary, Italy, Liechtenstein, Lithuania, Latvia, Luxemburg, Malta, Netherlands, Poland, Portugal (60days), Slovakia, Spain, Switzerland
※ Denmark, Estonia, Finland, Iceland, Norway, Sweden (90 days within 180 days)