travelling from kolkata to busan and return.stop over at sanghai and kunming.do i need transit visa?

i am indian travelling from kolkata to busan and return.

1. 2 stop overs at kunming (connection time of 3h 40min) and sanghai(connection time of 2h 25min) while travelling from kolkata to busan.but no terminal change.

2. 1. 2 stop overs at sanghai(connection time of 5h 35min) and kunming (connection time of 1h 30min) while travelling from kolkata to busan.but there is a terminal change at sanghai. Shanghai-Pu Dong Apt (PVG)
Terminal:1 to Shanghai-Hongqiao Apt (SHA)Terminal:2.