LJ 721 then TW 250 at Narita
Busan → Tokyo → Seoul
Timetable, Tokyo time
15:35LJ 721 from Busan at the gate
08:55TW 250 to Seoul leaves the gate
17 h 20 apart on the timetable, overnight
TW 250 leaves 17 h 20 after LJ 721 arrives on the timetable: more than half a day, so not a connection we count.