SQ 7448 then SQ 7444 at Bangkok
Singapore → Bangkok → Seoul
Timetable, Bangkok time
03:04SQ 7448 from Singapore at the gate
15:08SQ 7444 to Seoul leaves the gate
12 h 04 apart on the timetable
SQ 7444 leaves 12 h 04 after SQ 7448 arrives on the timetable: more than half a day, so not a connection we count.