Seoul is 13 hours ahead of Atlanta

There is no standard 8-to-6 overlap. Someone joins early or late.

The 13-hour offset between Atlanta and Seoul means there's no point hunting for a 9-to-5 overlap — there isn't one. Expect compromise: someone in Atlanta or Seoul will need to take the call outside the usual 9-to-5, so share that load. Keep an eye on the calendar — Atlanta observes daylight saving and Seoul doesn't, which nudges this window by an hour twice a year.