K4 550 then ZE 606 at Narita
Chicago → Tokyo → Seoul
Timetable, Tokyo time
11:59K4 550 from Chicago at the gate
11:20ZE 606 to Seoul leaves the gate
23 h 21 apart on the timetable, overnight
ZE 606 leaves 23 h 21 after K4 550 arrives on the timetable: more than half a day, so not a connection we count.