Kaalidas

Vidyaa kills the women because she suffers from schizophrenia following the death of her daughter. She created an imaginary version of her husband Kaalidas in her mind, and her delusion drives her to eliminate what she perceives as rivals for her husband's attention. The killings stem from her intense possessiveness and inability to separate reality from her fantasy.

Earlier scenes show Vidyaa feeling isolated as Kaalidas spends long hours working on the case, establishing the emotional strain that contributes to her mental break.

The mysterious tenant is not a real person but a figment of Vidyaa's imagination. The face of this imaginary figure is revealed to be George's son, who visits the same parlor that Vidyaa and the victims frequent. This explains why the tenant bears such a striking resemblance to someone from Vidyaa's past.

The tenant's uncanny resemblance to Vidyaa's college love is the first hint that something psychological is at play rather than a real threat.

Vidyaa develops schizophrenia after the death of her and Kaalidas' daughter. The grief from this loss triggers her mental breakdown, causing her to create an imaginary version of her husband. This delusional figure becomes central to her identity and drives her violent actions against other women.

The tension in their marriage and Vidyaa's isolation at home hint at deeper emotional wounds from their daughter's death.

Kaalidas proves Vidyaa's guilt through forensic evidence. A blood sample taken from the last victim matches Vidyaa's blood, providing conclusive DNA evidence that links her directly to the murder. This scientific proof confirms what Kaalidas suspects after discovering the truth about her mental state.

The investigation's progression toward finding physical evidence mirrors the building tension as Kaalidas gets closer to solving the case.

Kaalidas quits his job as a police officer and adopts the name Pappu to become the man Vidyaa loves. Since her delusion centers on an imaginary version of him, Kaalidas chooses to embrace this fantasy entirely to save her. By becoming Pappu, he fulfills her psychological need and provides a fragile, loving reality for both of them.

The imaginary character's final attempt to kill Vidyaa demonstrates how dangerous her delusion has become, pushing Kaalidas toward this drastic choice.

The imaginary version of Kaalidas attempts to kill Vidyaa because she represents the obstacle to being with her husband exclusively. In her delusion, this violent act symbolizes her desire to remove anyone who comes between her and Kaalidas, even herself. It underscores the fatal extent of her possessiveness and the internal conflict within her fractured mind.

This moment connects back to the earlier killings, showing the imaginary figure acting out Vidyaa's violent intentions.

During the investigation, police initially suspect the Blue Whale Challenge might be responsible for the deaths, given the pattern of young women dying under similar circumstances. However, this theory proves incorrect as the real motive stems from Vidyaa's personal delusion rather than any viral challenge.

The investigation's wrong turn toward the Blue Whale Challenge adds to the mystery while misdirecting both the characters and the audience.

Vidyaa and all the murder victims are linked by their regular visits to the same parlor. This common thread becomes a crucial clue in the investigation, ultimately revealing that George's son also visits the same parlor. The parlor serves as the setting where Vidyaa's imagined figure takes on a real face, connecting her delusion to the victims.

The discovery of this connection allows Kaalidas to trace the pattern and eventually uncover the truth about Vidyaa's mental state.