DL 1625 then DL 189 at Atlanta
Memphis → Atlanta → Seoul
Timetable, Atlanta time
10:20DL 1625 from Memphis at the gate
09:30DL 189 to Seoul leaves the gate
23 h 10 apart on the timetable, overnight
DL 189 leaves 23 h 10 after DL 1625 arrives on the timetable: more than half a day, so not a connection we count.