TRANSIT Permit required at Shanghai, Pu Dong (PVG) transfer to Shanghai, Hongqiao (SHA)?

Dear Sir/Ma'am,

This is in reference to Air Ticking Booking , I bring to your kind notice that I have booked the Air Ticket for my Wife and Son from New Delhi, India (DEL) to Gimpo, Seoul, South Korea (GMP) via Shanghai, Pu Dong (PVG) Terminal-1 and Shanghai, Hongqiao (SHA) Terminal-1 Airport and both of them are holding valid Indian Passport and are travelling on 18-May-2015 and returning on 21-June-2015 from CHINA EASTERN AIRLINES. But I have a query about the Shanghai, Pu Dong (PVG) Terminal-1 and Shanghai, Hongqiao (SHA) Terminal-1 Airport, location of these two Airports are different locations so they required TRANSIT VISA at Airport to transfer on same date 18-May-2015 from Shanghai, Pu Dong (PVG) Terminal-1 to Shanghai, Hongqiao (SHA) Terminal-1 Airport as they have 04:30 hours layover time to catch the next flight ? Please help and guide us as my family are travelling first time from New Delhi, India to Seoul, South Korea via China (Shanghai,Pu Dong (PVG) Terminal-1 and Shanghai, Hongqiao (SHA) Terminal-1 Airports). In case if required TRANSIT VISA at aforesaid Airport then what is the procedure for the obtaining it. Once again please help and guide us.

Thanking you.
Anticipate your prompt reply.

Thanks & regards,
Shankar Kumar.
Seoul, South Korea.