ZE 628 then CZ 6074 at Incheon
Sapporo → Seoul → Yanji
Timetable, Seoul time
16:00ZE 628 from Sapporo at the gate
14:35CZ 6074 to Yanji leaves the gate
22 h 35 apart on the timetable, overnight
CZ 6074 leaves 22 h 35 after ZE 628 arrives on the timetable: more than half a day, so not a connection we count.