NH 8401 then ZE 608 at Narita
Chicago → Tokyo → Seoul
Timetable, Tokyo time
20:06NH 8401 from Chicago at the gate
20:00ZE 608 to Seoul leaves the gate
23 h 54 apart on the timetable, overnight
ZE 608 leaves 23 h 54 after NH 8401 arrives on the timetable: more than half a day, so not a connection we count.