if raunak wud hav been -ve it wud hav ben revealed when we never thought of him being -ve so tht it brings shock to the audience but rite now if raunak is shown -ve it is sumthing very predictible and will lose audience intrest cuz they r expecting it.
so according to me they r trying to show tht raunak is -ve but he wont be and this whole raunak - shivani funda is sumthing else which we will cum to knoe after a few episodes...