ZE 605 then JL 6787 at Narita
Seoul → Tokyo → Taipei
Timetable, Tokyo time
10:10ZE 605 from Seoul at the gate
10:24JL 6787 to Taipei leaves the gate
14 min apart on the timetable
The last days
ZE 605 and JL 6787 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.