The 2014 hit, starring Varun and Alia Bhatt, was a love story between a young feisty Ambala girl and a carefree Delhi boy.
The 29-year-old "Badlapur" actor says they are taking the movie ahead like a franchise but the characters are new.
"It's a totally different world. Badrinath is a boy from Jhansi and it is about him and his 'dulhania' (bride) and the issues they go through. I can't talk too much about it but its different (from Humpty). It is just the same cast, it's a love story and we are taking it ahead," Varun told PTI.
Meanwhile, the actor is excited for the sequel of David Dhawan's hit comedy, "Judwaa", which starred Salman Khan in a double role.
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"It is still in the scripting stage, so by next year we should get going with that. All I will say now is 'Judwaa 2' is a big responsibility for me," he said.
David, who directed the Salman-Karisma Kapoor starrer, will also direct the sequel. The father-son duo last worked together in 2014 romantic-comedy "Main Tera Hero".
The actor will be next seen in "Dishoom", releasing on July 29.