VN 310 then TW 248 at Narita
Hanoi → Tokyo → Seoul
Timetable, Tokyo time
12:45VN 310 from Hanoi at the gate
08:55TW 248 to Seoul leaves the gate
20 h 10 apart on the timetable, overnight
TW 248 leaves 20 h 10 after VN 310 arrives on the timetable: more than half a day, so not a connection we count.