Why is China building a dam for Pakistan in PoK? | Ghanti Bajao Special

Pakistan with China's aid is building a huge dam in Pakistan occupied Kashmir area. The Diamer Bhasha Dam was inaugurated by the Pakistani Prime Minister Imran Khan. Imran expressed happiness over the construction of the 'biggest dam in the history of Pakistan'.

But why is China aiding Pakistan in building the dam? What is China's motive? Here is a report explaining everything about it.