i think mongi is pretending to believe santo and birwa because i think is is too blindly in luv with sarang to see anything else. She could be bluffing so santo and birwa get off her back and stop keeping an eye on her so she can run away with sarang when she has the chance
i wud happily believe this as she is totally ungrateful..except for the fact tht i dnt think monghi has the brains or smartness to fake such a thing..she is pure dumbness..