RF 558 then KE 115 at Incheon
Nha Trang → Seoul → Yanji
Timetable, Seoul time
10:10RF 558 from Nha Trang at the gate
09:20KE 115 to Yanji leaves the gate
23 h 10 apart on the timetable, overnight
KE 115 leaves 23 h 10 after RF 558 arrives on the timetable: more than half a day, so not a connection we count.