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Karthik Roy is a timid, chronically underconfident corporate accountant trapped in a monotonous existence. Bullied by his domineering boss, Mr. Kamath, and hopelessly in love with his glamorous colleague Shonali Mukherjee from afar, Karthik feels invisible. His self-loathing reaches a breaking point one rainy night when he considers ending his life. Suddenly, his landline phone rings. A calm, authoritative voice identical to his own greets him. The mysterious caller claims to be Karthik himself, promising to help him transform his life if he strictly follows a set of unconventional rules.Desperate for change, Karthik complies. The caller guides him on how to stand up to Kamath, dress sharply, and successfully win Shonali’s affection. Shonali is charmed by the sudden, vibrant shift in Karthik's personality, and the two quickly fall in love, embarking on a passionate romance. Professionally, Karthik thrives, utilizing insider knowledge only he possesses to impress the company executives. However, the psychological toll begins to mount. The phone calls become increasingly erratic and demanding. When Karthik attempts to assert his independence or question the caller, the mysterious voice turns threatening, vowing to destroy everything Karthik has built and revealing an intimate awareness of his deepest, darkest secrets.Fearful and exhausted, Karthik's reality fractures further. One night, after a severe altercation with the voice, he wakes up to find his apartment completely trashed, with blood on his hands and no memory of the hours prior. Desperate to escape the psychological torment, he smashes his phone, packs his bags, and flees to Goa with Shonali to start fresh. Yet, the nightmare follows him; the phone rings in his hotel room, proving the tormentor cannot be shaken so easily.Determined to end the cycle, Karthik consults a psychiatrist, Dr. Kamath, who helps him unlock a repressed childhood trauma. It is revealed that Karthik had an abusive father and an older twin brother named Karthikeya, who tragically drowned in a well. Overwhelmed by guilt and trauma, Karthik's psyche split, creating a dissociative identity disorder. The voice on the phone was actually Karthik himself, acting out his suppressed aggression and ambition during blackouts.Armed with this profound realization, Karthik confronts his inner demons. By accepting the dark, assertive part of himself rather than fearing it, he integrates his fractured psyche. The film concludes with a healed Karthik, free of hallucinations, embracing a confident future alongside Shonali.