Iss Pyaar Ko Kya Naam Doon? S01 E116 Shashi gets the wrong medicine

Arnav feels guilty for being rude to Khushi. Shyam is angry for the delay in his engagement with Khushi. In a fit of rage, he puts Shashi’s life in danger, giving him the wrong medicine. Why doesn’t Shyam and Khushi’s engagement take place?