UA 2847 then K4 532 at O'Hare
San Francisco → Chicago → Seoul
Timetable, Chicago time
07:13UA 2847 from San Francisco at the gate
06:30K4 532 to Seoul leaves the gate
23 h 17 apart on the timetable, overnight
K4 532 leaves 23 h 17 after UA 2847 arrives on the timetable: more than half a day, so not a connection we count.