TG 657 then UL 407 at Bangkok
Seoul → Bangkok → Colombo
Timetable, Bangkok time
14:45TG 657 from Seoul at the gate
13:55UL 407 to Colombo leaves the gate
23 h 10 apart on the timetable, overnight
UL 407 leaves 23 h 10 after TG 657 arrives on the timetable: more than half a day, so not a connection we count.