EU 6677 then KE 888 at Pudong
Chengdu → Shanghai → Seoul
Timetable, Shanghai time
20:00EU 6677 from Chengdu at the gate
14:00KE 888 to Seoul leaves the gate
18 h apart on the timetable, overnight
KE 888 leaves 18 h after EU 6677 arrives on the timetable: more than half a day, so not a connection we count.