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Eight-year-old Pappu repeatedly troubles his mother Indira and gets scolded for bed-wetting. His elder brother Kishore plans to watch a porno with friends in his room, which Pappu insists on joining. When Kishore refuses, Pappu cuts the power, causing a short circuit, and Indira lashes out at both him and her husband for not stopping at one child.

Distraught after the confrontation at home, Pappu goes to the river to end his life. A man stops him and takes him to his home, revealing himself to be a scientist with a laboratory. This chance encounter sets the course for the extraordinary experiment to come.

The scientist administers a medicine intended to turn a boy into a fully grown man. Pappu agrees to the treatment and awakens as a young adult, yet his mind remains that of an eight-year-old. Only the scientist and Pappu's classmate Deepak know the truth.

With the physical changes complete, Pappu's mind is still that of a child. The scientist and his trusted friend Deepak are the only ones who know the real situation, while the world believes Pappu is simply an adult with unusual empathy for children.

As an adult, Pappu becomes Vichu and applies for a job at a toy manufacturing company under that name. He lands the position when the owner wants someone who can understand and empathize with children. The owner's daughter Priya is introduced, whom Vichu had helped earlier at an amusement park.

Vichu forms a connection with Priya, the owner's daughter, and they fall in love. Their budding romance is tempered by Priya's memories of Vichu helping her at the amusement park long before, tying their past to their present.

Raj, a fellow employee, grows jealous of Vichu's closeness with Priya, while Pappu's mother Indira becomes increasingly depressed over his disappearance. The household strains under the weight of his unresolved fate.

Feeling the distance from his mother and the need to reclaim his true self, Pappu asks the scientist to revert him to his eight-year-old body. The mutation is reversed to Pappu, allowing him to reconcile with his mother and confront his past.

Pappu now lives as an eight-year-old boy during the day and as a 28-year-old man at night. Priya starts to accept the strange dual life, while Vichu's love for her grows as he grapples with his own identity.

Priya confesses her love, and Vichu tells her to be with a man her own age. However, the scientist's coercion leads him to reciprocate her feelings and to protect their fragile relationship, setting the stage for marriage.

Priya asks Vichu to accompany her to a matinee show, but he refuses, fearing exposure of the truth. The tension between them fuels Priya's resolve as their wedding approaches under increasingly strained circumstances.

On the day of their marriage, Raj and his men kidnap Vichu. During the day, Vichu is temporarily Pappu, and the abductors release him, thinking they have kidnapped a child. This event precipitates the twist in their wedding night.

That evening, as the sun sets, Pappu transforms back to Vichu and marries Priya. The couple's life continues with the reality of Vichu's condition looming over them, complicating their happily ever after.

Priya becomes pregnant, and the couple welcomes a son. The pregnancy forces them to confront the moral and emotional consequences of Vichu's dual identity, especially for Priya who must navigate life as a wife of a child at times and a mother-to-be with a grown man as her partner.

Two decades pass and Pappu is a 28-year-old who remains Priya's husband, while his son is now about 20 and looks like him. The scientist confirms there is no cure or remedy, leaving the family with an unending, complicated bond between generations.