[4][5][6] It was the third South Indian film to feature a single actor after The Guard (2001- Malayalam) and Shanti (2005- Kannada).

When Masilamani confronted his wife about the affair, she regretted having it and said that she did it for the money to pay for their son's medical expenses.

Masilamani, realizing that he won't be able to legally fight these powerful men, decides to murder them using a particular MO, which includes leaving a "single slipper of size 7" next to the dead bodies.

Usha accidentally finds the other pair of "single slipper of size 7" and figures out that Masilamani is involved in the serial killing of the men with whom she had affairs.

Now that Masilamani has committed these three murders in the same MO, he makes a veiled threat that he will reveal the proof of the scandal if he is not released for his crime.

The movie ends with Masilamani walking out of the police station with his son, making peace with his wife's death.

Chennai Vision reviewing it noted, "Oththa Seruppu Size 7 is a rare attempt in Indian cinema.

"[16] Behindwoods rated 3.25/5 and stated that "Oththa Seruppu is a unique and engrossing film that is crafted with cinematic experiments.

"[17] Sify rated 3/5 and stated that "Oththa Seruppu Size 7 review: Go for it if you are looking for something new and you will surely love the experience.

"[18] Baradwaj Rangan of Film Companion South wrote "Oththa Seruppu has also got to be one of the wittiest “message movies” ever, for, despite the cover of crime, the narrative is actually about haves and have-nots".