Quick facts about Seoul

Currency: South Korean Won (KRW)
Language: Korean
Population: ≈ 9.7 million (Seoul)
Climate: Humid continental, with hot summers and cold winters
Time Zone: Korea Standard Time (KST), UTC+9
Visa: South Korea allows visa-free entry for many nationalities, including most EU citizens, as well as visitors from the U.S., Canada, Australia, and several other countries for stays of up to 90 days.
Transportation: Incheon International Airport (ICN) serves as the main international gateway. Seoul has an extensive public transportation system, including subways, buses, and trains, making it easy to navigate the city.