TW 251 then TW 250 at Narita
Daegu → Tokyo → Seoul
Timetable, Tokyo time
13:20TW 251 from Daegu at the gate
08:55TW 250 to Seoul leaves the gate
19 h 35 apart on the timetable, overnight
TW 250 leaves 19 h 35 after TW 251 arrives on the timetable: more than half a day, so not a connection we count.