I think they didn't leave the show permanently ( Hasan & Piyush). we know that Hasan is in Austria with his spouse and his baby girl. I think Piyush is taking a break because he just got married a while back and he needs to spend time with his wife. I think these events are pretty self explanatory. Of course, I did some research because i was MIA and then came back and found Goutam & Abhi MIA. 😆