Apoorva is looking for a job. He lands a job with the Dhirubhai's Global Sanskar Group of Industries. Apoorva meets Aarti (niece of Dhirubhai) and falls in love with her. Apoorva lies to Dhirubhai and Aarti about his family. Raju, Apoorva's best friend, builds up a fake family. After a month Aarti marries Apoorva. It shows how Apoorva and other family members try to hide the truth of this fake family from Dhirubhai and his niece Aarti.
Sajan Re Jhoot Mat Bolo revolves around the humor that comes from situational lies and liars. It is a situational comedy that arises from a small lie that the protagonist, Apoorva, had to tell his employer Dhirubhai Jhaveri to get a job. Dhirubhai is a successful businessman who hates lies and liars and believes in family bonding and values. His belief in these values at times crosses levels of normalcy and are unbelievably rigid. Apoorva was raised in an orphanage and, to get the job in Dhirubhai's company, lies that he has a full-fledged family in India. Apoorva's description of his imaginary family makes Dhirubhai fall in love with each and every member.
Dhirubhai has a niece Aarti, who is young, beautiful and believes in the same values as her uncle. They both trust Apoorva blindly: He has earned this trust and respect on the basis of his hard work. Over time he has become the Man Friday for Dhirubhai as well as Aarti. Apoorva has also developed a liking for Aarti but has refrained from expressing his feelings to her.
Dhirubhai fixes Aarti's marriage but, in a dramatic turn of events, it is called off at the last moment. Dhirubhai decides to marry Aarti with Apoorva. He announces that the marriage will take place in India, in the presence of Apoorva's family. Apoorva tries to convey the truth to Aarti but realizes that it will break her heart. He asks his best friend Raju to set up his fake family in India before the marriage, which has to take place in a few days.
Raju does the needful and when Apoorva arrives in India with Dhirubhai and Aarti, he comes face to face with family for the first time. From here starts a non-stop comical journey in which the family members, who are from various backgrounds, try to find their feet in their new characters and live up to Dhirubhai and Aarti's expectations. And the fake family never speaks truth to Dhirubhai.
In a series of episodes particularly for a Valentine's Day special, the family was shown on a trip to Goa. On the trip, Dhirubhai clashes with Preeti who is roaming around in modern clothes. What follows is a series of attempts by Apoorva to make him believe that doubles do exist in this world. Dhirubhai refuses to accept it but, in the end, as Apoorva is about to unfold the secret of his family, Dhirubhai meets his own look-alike and believes Apoorva. Once again the family is saved from being destroyed.
