Basically I feel Param and Kalyani have cooked up a story here of Kalyani being his wife from South India and he's coming back home to introduce her to his family and she's 6 mons pregnant, etc. I feel Kalyani is mu'ed Param for being some small level chor and has recruited him to work with her and he's also going along with it, pretending to be stupid and abrasive and unpad, maybe pretending to have a crush on Kalyani. But in reality I feel Param is doing this to find the location of the drugs that Kalyani had hidden. He's the real drug lord.
Yup this is what I feel too.
Kalyani thinks, he's going along with her where in actually Param would be keeping tabs on her activities to find the drugs.
Then he will also not allow Kalyani's identity to come out in front of Meenakshi until he finds his goods.