Seoul is exactly 1 hour ahead of Hong Kong year-round. When it's 3:00 PM in Seoul, it's 2:00 PM in Hong Kong. Neither city observes daylight saving time, so the difference never changes.
Seoul uses Korea Standard Time (KST, UTC+9) while Hong Kong uses Hong Kong Time (HKT, UTC+8). This 1-hour difference remains constant throughout the year.
Any business hours work great! With only a 1-hour difference, 9:00 AM - 6:00 PM Seoul corresponds to 8:00 AM - 5:00 PM Hong Kong. Full business day overlap.
Seoul and Hong Kong are both major Asian financial centers. K-pop is hugely popular in Hong Kong, and the 3.5-hour flight makes weekend trips and business travel common between these cities.