If there is a 3rd world war, Its not going to be with Atom bombs or Guns. It will be Bio war either Cyber War. At this point many counties not ready for Cyber War; maybe except few countries. But many countries already created bio-weapons and they started testing in small countries (Eg: Zika Virus, Ebola virus ). There is a 2006 Tamil movie "E" clearly explains the Bio-war and how they using small countries for testing. It will sound funny to many people but it's true! if u do a deep research about it you will understand the dark side of the upcoming world.
Story: Movie starts with a terrorist attack on Indian Embassy in Malaysia. 70 year old man use his inhaler and he became super human for 5 minutes, killed twenty people in the embassy and after five minutes he also dies. Now Indian government must investigate the attack and they getting a lead with symbol of Love in the old man's head which is pointing the terrorist called "LOVE". Ex-RAW agent Akilan who killed love 4 years ago in Kashmir, now they need to bring him back to investigate this attack. He starts the investigation with help of Nithiya Menon (RAW case officer) and Malaysian Police. Rest of the story how he is finding out "Love", How he escaped from India, What happened to Vikram's wife Nayantara, who's is the mastermind behind love's untraceable activities, How he going to stop love's plans... You watch it on Screen!!
Acting: What can we say about Vikram? He gives his life and soul to any character that he play and in Iru Mugan too, it is his show all the way. As a RAW Agent Akilan he is stylish cold-hearted intelligent officer & Effeminate Character "Love" brings out the manliness and feminine side. He nailed it as Love. he made audience to though like they are two different actors with his perfect acting. Nayanthara (Ethical Hacker) and Nithya Menen (RAW case officer) have their roles clearly to further development of story and bring in the color to the movie. Thambi Ramaiya made us to laugh in few scenes as Malaysian Police Officer.
Technical: Kudos to Director Anand Shankar for fresh elements without stereotype story. There are lot of chemical formulas used by the characters with references. Specially the "Speed" drug (Crystal methamphetamine) used by Hitler in 2nd World war to increase his soldiers speed. I love the way he explain each detail to make us understand. He done a lot of research in small details too. Specially in the title card they showing the Evolution of weapons used in Wars. Harrish Jeyaraj did decent work with BGM and songs. R. D. Rajasekhar cinematography is colorful well captured Malaysia but what is important to movie only.
Plus+: Vikram, Nayantara, Love Character, Interval Block, Technical details in small things, Harrish Jeyaraj BGM, Cinematography & director brought new elements to Tamil audience.
Minus-: Event though shot in high quality & eye catching costumes, unnecessary placements of songs slowing down the movie. There are a few logical questions which look unanswered like why the love character is like that? why the police didn't try to enter the room in hospital when they lost the surveillance?
But still Iru Mugan has its pluses in the form of technical skill and performances. I usually don't write long reviews for movies except i'm impressed.I'm impressed with the concept here. My rating for this movie would be 3.5/5
P.S: Above review was written in my point of view and everyone got different taste!
Tingnan pa 
