What a great OS. Arnav always dropped hints to her that he wants to marry her by using yellow colour which was also her favorite. But she couldn't realize the real meaning behind his words. Arnav called Khushi Kumari Gupta not Sing Raizada, said my room not ours. It means they are not married and he was proposing.
Arnav's possessiveness was beyond my imagination. He doesn't even want to share Khushi's favorite colour with his niece/nephew. Yellow painted walls are reserved only for their future room.