K4 550 then ZE 602 at Narita
Chicago → Tokyo → Seoul
Timetable, Tokyo time
11:59K4 550 from Chicago at the gate
11:50ZE 602 to Seoul leaves the gate
23 h 51 apart on the timetable, overnight
ZE 602 leaves 23 h 51 after K4 550 arrives on the timetable: more than half a day, so not a connection we count.