MH 377 then SQ 121 at Kuala Lumpur
Guangzhou → Kuala Lumpur → Singapore
Timetable, Kuala Lumpur time
18:50MH 377 from Guangzhou at the gate
18:30SQ 121 to Singapore leaves the gate
23 h 40 apart on the timetable, overnight
SQ 121 leaves 23 h 40 after MH 377 arrives on the timetable: more than half a day, so not a connection we count.