Atlanta is 13 hours behind Seoul

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

Atlanta is 13 hours behind Seoul, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Atlanta dials in early while it's still late afternoon or evening in Seoul. Finally, Atlanta observes daylight saving and Seoul doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.