UA 3532 then K4 538 at O'Hare
Knoxville → Chicago → Seoul
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
15:00K4 538 to Seoul leaves the gate
20 h 17 apart on the timetable, overnight
K4 538 leaves 20 h 17 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.