MM 578 then TW 250 at Narita
Sapporo → Tokyo → Seoul
Timetable, Tokyo time
17:25MM 578 from Sapporo at the gate
08:55TW 250 to Seoul leaves the gate
15 h 30 apart on the timetable, overnight
TW 250 leaves 15 h 30 after MM 578 arrives on the timetable: more than half a day, so not a connection we count.