Am sorry Didi..
But i think its Karthik After Roopal said & after watching the video
Look at Karthiks Hand Carefully while he is talking to Naina...He has a small plaster on his right side of the right hand....Look at his shirt/Jeens....Its the same which that Dart wore...
Here is the Zoomed Area:
Look at the Dart Pics....
I take my word Back....
Now Am 100 % sure the Dart is Karthik.....
Wat do u guys Say????
Okay Ekta mmayee is trying to fool us...I will confirm and let u know...