From London~Transit at Chongqing to Shanghai and 144 hour policy

My first flight plan is combination of two flights.
China airlines from London to Chongqing,
4 hours stopover and another flight (Hainan airlines) to Shanghai. From Shanghai I will again fly to Busan, south Korea.

So, in summary, my flight plan is as follwing.
1. London to Chongqing
(Stopover for 4 hours ; direct transit, so no passing through immigration, continue to the following flight, but with different airline)
2. Chongqing to Shanghai
(Planning to stay for a few days without visa)
3. Shanghai to Korea, Busan

Will I be eligible for the 144 hour exemption? Or, will i be able to stay without visa for 72 hours , from the moment I land in Chongqing?