Seoul is 17 hours ahead of Los Angeles during PST (winter), and 16 hours ahead during PDT (summer). When it's 9:00 AM in LA, it's 2:00 AM (next day) in Seoul. Korea does not observe DST.
The time difference shifts by 1 hour when LA switches between PST and PDT while Seoul stays on KST (UTC+9) year-round.
Late afternoon LA works! 4:00 PM - 6:00 PM LA corresponds to 9:00 AM - 11:00 AM Seoul (next day). LA evening catches Seoul morning.
Seoul and Los Angeles have strong cultural ties through K-pop, Korean cinema, and the large Korean-American community. Korean Air and Asiana operate multiple daily nonstops between LAX and Incheon.