Maybe they are doing reversal role. Shravani is going to be human; Mihir naag.U r right..they did it...but 1. It was QKR so doesn't matter...2. there main leads were both humans and it was a simple matter of just remembering...here things are complicated... it's naagin...and they are reincarnating main naagin in same season? Really? And Bela was naagrani...is Shravani gonna be human? Is that what's happening... turning Bela human like Mahir?