KR 721 then TG 678 at Bangkok
Siem Reap → Bangkok → Guangzhou
Timetable, Bangkok time
17:05KR 721 from Siem Reap at the gate
15:25TG 678 to Guangzhou leaves the gate
22 h 20 apart on the timetable, overnight
TG 678 leaves 22 h 20 after KR 721 arrives on the timetable: more than half a day, so not a connection we count.