Seoul is 9 hours ahead of London during GMT (winter), and 8 hours ahead during BST (summer). When it's 9:00 AM in London, it's 6:00 PM in Seoul. Korea does not observe DST.
The time difference shifts by 1 hour when London switches between GMT and BST while Seoul stays on KST (UTC+9) year-round.
Late afternoon Seoul works! 5:00 PM - 7:00 PM Seoul corresponds to 8:00 AM - 10:00 AM London (winter). Seoul evening catches London morning.
Seoul and London have growing ties in K-pop, gaming, tech, and finance. Korean Air and Asiana operate direct flights to Heathrow. Korean culture (K-drama, K-beauty) is hugely popular in the UK.