Guys,Dhruv is Karan! The directors have made this Twin-story,because the viewers should think,that there's a double-role! But it's Dhruv-this all is his plan! And I have two reasons,why I think so!
First... They have never mentioned about this Twin and Kavita is not the person,who would give his son to someone else
And second... The person who is trying to kill Sundari,is actually Karan, because when he came to Reizada House,just then someone tried to kill Sundari!And why would Karan do such things? So that's means that Karan is Dhruv!