KE 657 then UB 20 at Bangkok
Seoul → Bangkok → Yangon
Timetable, Bangkok time
13:25KE 657 from Seoul at the gate
09:25UB 20 to Yangon leaves the gate
20 h apart on the timetable, overnight
UB 20 leaves 20 h after KE 657 arrives on the timetable: more than half a day, so not a connection we count.