Travelling from seoul to Kolkata (terminal change shanghai)

Do you use the China Eastern Airline for the whole trip? If so, of course the through check-in can be done at the first departing site and then your luggage will be directly transported to Kolkata.

For hand luggage, you need to take on your own. The free shuttle buses can be found at the gate no. 23 and gate no. 27 at T2. The route map can be found on the official website of the airport. And the bus will stop at the gate no. 1 and gate no. 7 of T1. The signages are very clear in the airport, so you can easily find the shuttle bus. Take it easy!