Tej Charanraj, is a mentally challenged guy, who loves his mother so much, and would do anything for her, as she is his world. Like wise, his mother loves her son and showers him with adoration even though he is mentally effected. Meanwhile, the antagonist, who is a real estate fraud, targets Tej's house and to acquire the ownership papers for building and land by force and manipulation.

In the mean time, Shivani initiates a friendship towards Tej, who reciprocates it in his own way. This slowly evolves into a tender relationship of sorts between them. One day, his uncle unexpectedly pays a visit to his house, and requests to see his mother. 

Tej, becomes visibly uncomfortable, and says that his mother is taking a bath and that to invite him in. Following that, he kills his uncle. The rest of the plot revolves around why he kills his uncle?, and why he tries to hide his mother?

Tej Charanraj is the son of a popular veteran actor Charan raj, who is predominately known for his roles as a villain. Though it seems like Tej has some potential, his performance in Lali, is way too much. And has made a wrong choice with trusting this script to mark his debut into Tamil cinema. Debutant Shivani has very little to perform other than being the hero's love interest. 

Aarupadaiyappan, has attempted to make an intense film which revolves around the sentiments of a mentally challenged son and a loving mother, almost like Jiiva's Ram. Though it sounds interesting, the way the film has scripted was really poor. It makes the viewer question the essence of suspense and co-incidents. Agree that the character is mentally challenged but, that does not justify the cringe-worthy reason behind Tej's murders. Like wise the screenplay was mindless, and is all over the place.

Ram Gopalkrishnan has handled the music department and his background scores are comparatively better than his songs. Nagabushan's cinematography skills come to fore and his shots are decent.

In short, Lali, is not worth your time.