CA 1620 then KE 852 at Beijing
HSF → Beijing → Seoul Incheon
Timetable, Beijing time
12:55CA 1620 from HSF at the gate
10:40KE 852 to Seoul Incheon leaves the gate
21 h 45 apart on the timetable, overnight
KE 852 leaves 21 h 45 after CA 1620 arrives on the timetable: more than half a day, so not a connection we count.