The story follows Mimi, the pampered, only daughter of a wealthy Kolkata businessman, whose life takes a dramatic and terrifying turn on the day of her departure for higher studies abroad.Mimi’s marriage has been smoothly arranged with Aryan, her childhood best friend and the son of her father’s close friend. Following a warm engagement ceremony and a sweet farewell lunch with Aryan, Mimi heads to the airport driven by their loyal driver, Ramu Kaka. However, fate takes a dark turn when their car breaks down midway. Stranded on the road after sending the driver away, Mimi is suddenly surrounded and chased by a group of rowdy thugs who claim to "know" her and want revenge.While running for her life, Mimi collides with a car belonging to Mahir Sen, a wealthy man whose sheer intimidating presence sends the thugs running in terror. Desperate, Mimi hitches a ride with him to reach the airport, but instead of the airport, a furious Mahir kidnaps her and forcefully brings her to his beautiful suburban villa.At the villa, a bewildered Mimi is thrust into a massive identity crisis. A sweet 5-year-old girl named Nidhi runs to her, calling her "Mammum" (Mother), and the housemaid addresses her as "Boudimoni" (Madam). It becomes shockingly clear that Mimi looks exactly like Mahir's runaway wife—a woman who allegedly betrayed Mahir, abandoned her innocent child, and eloped with another man.Despite Mimi's desperate pleas that she is a victim of mistaken identity, a deeply hurt and vengeful Mahir refuses to believe her. He believes she is just acting. He traps her in the house, subjecting her to his intense rage and bitter confrontations, demanding to know the name of her lover. Amidst this terrifying ordeal, Mimi feels an unexplainable, deep emotional pull toward the innocent little Nidhi, who refuses to eat from anyone else's hand.The story reaches a tense cliffhanger as Mahir aggressively corners Mimi against the wall, demanding answers for destroying his family, only to be interrupted by a soft knock on the door by little Nidhi, leaving Mimi trapped in a dangerous web of a past she knows nothing about.