I did not know KSG or Qubool hai before Mangalpur mahaepisode. So, the mahaepisode was the first time i watched him.
There is a scene during Arti - Yash song , where Asya come and sit on the stairs and at that time, and towards the end of the song, Asad stares at zoya and zoya looks away with shyness. My heart skip a beat during that scene, for the intensity in his eyes.
Next scene was immediate - Asya returning to bhopal, and she is sleepy, asad makes her sleep on his shoulder, that whole episode made me breathless, literally.
So, i am not sure yet, if it is KSG that made me breathless. it is ksg in asad avatar, that made in breathless.