DE 1669 then LH 712 at Frankfurt
Heraklion → Frankfurt am Main → Seoul
Timetable, Frankfurt am Main time
17:50DE 1669 from Heraklion at the gate
15:30LH 712 to Seoul leaves the gate
21 h 40 apart on the timetable, overnight
LH 712 leaves 21 h 40 after DE 1669 arrives on the timetable: more than half a day, so not a connection we count.