Based on a common concept of look alikes but the story moves forward in real as well as flashback.
An Introduction to the characters
He is now father to two kids. . He is now rough and tough like what he was before meeting Mannmeet,but at the same time goes through frequent mood swings where he is emotional at times and in his own world and at times pretending to be strong and determined.
"But one thing which has not changed is his love for Mannmeet" 

She is working for Musa Khan's real estate company but is not satisfied with the job and is searching for one big break which will give her scope to do what she wants to.
Her ambitions are high but she does not compromise on anything to achieve those dreams which she desires to fulfill someday.
She will accidentally start working with Yash before having a series of horrifying and odd experiences with him..
She is very friendly with Venu Punjabi who is her best friend and also with Bakul Chetty who is Venu's love interest.
3) Venu Punjabi:
4)Bakul Chetty:
She is Maansi's close friend, not as close as Venu and feels Venu has feelings for Maansi and both are dating each other. She is completely unaware of Venu's love for her.
She will be a very important part of a parallel funny track involving Maan, Maansi, Bakul and Venu
She comes only in memories of Yash and will be seen regularly in flashback moments, moments which are already shot and moments which were demanded by fans but were never shot.
As flashback moments don't need a storyline, they just need a reason to relate to flash on the screen..Yash and Mannmeet scenes would come at regular intervals in the story line with an idea to show all the possible desired "Mannmeet moments" 
An idea which may have been used before but what makes the story different is the way it is narrated, the way it is designed.