SQ 638 then TW 250 at Narita
Singapore → Tokyo → Seoul
Timetable, Tokyo time
07:30SQ 638 from Singapore at the gate
21:35TW 250 to Seoul leaves the gate
14 h 05 apart on the timetable
TW 250 leaves 14 h 05 after SQ 638 arrives on the timetable: more than half a day, so not a connection we count.