CA 1202 then CA 123 at Beijing
Xi'an → Beijing → Seoul Incheon
Timetable, Beijing time
20:40CA 1202 from Xi'an at the gate
08:45CA 123 to Seoul Incheon leaves the gate
12 h 05 apart on the timetable, overnight
CA 123 leaves 12 h 05 after CA 1202 arrives on the timetable: more than half a day, so not a connection we count.