Sarathkumar tasted great success playing a moody cop in the commercially and critically acclaimed Por Thozhil (2023). Since then he has been trying to emulate its success in vain. Smile Man, his 150th film, is another such attempt, in which the actor yet again plays a brooding CBCID office grappling with Alzheimer’s disease, who is also on a hunt for a serial killer, notoriously known as Smile Man. Like most serial killer films in Tamil, Smile Man also suffers from the usual problems of convenient writing, cliches, and redundant flashbacks. Honestly, the film kicks off on a promising note. The epilogue has Chidhamabaram (Sarathkumar) chasing the serial killer only to get bashed by him after a near-fatal accident. The unknown killer swears to come back if Chidhambaram chooses to show up again as a cop. Meanwhile, we learn that Chidambaram’s partner (Sunil Menon), who is currently missing, has closed the Smile Man case, claiming that the serial killer was shot dead. Yet, in the present day, the murder starts to happen again. Bodies of victims with skin carved out to make a smiling face (the modus operandi of the killer) are found in the city, and Chidhambaram, despite his health condition, joins the force again to finish what he had started years ago.