Kya Haal, Mr. Paanchal? S01 E273 A Naagin In Kunti Nivas

A naagin visits Kunti Nivas in the disguise of Naina, a salesgirl. Panjiri suspects that Naina is a naagin. Kanhaiya drinks milk like a snake. Later, Panjiri frets when she enters Kanhaiya's room. Why?