Los Angeles is typically 17 hours behind Seoul. When it's midnight in Seoul, it's 7:00 AM the previous day in Los Angeles. South Korea does not observe daylight saving time, but Los Angeles does.
During US daylight saving time (March to November), the difference is 16 hours. During US standard time (November to March), the difference increases to 17 hours.
Optimal meeting window: 5:00 AM - 7:00 AM Los Angeles time (9:00 PM - 11:00 PM Seoul, or 10:00 PM - midnight in winter). Very early morning LA catches late evening Seoul.
Los Angeles has a large Korean-American community and strong entertainment ties to Seoul's K-pop and film industries.