Cast: Dileep, Charmi, Sathyaraj, Lal, Biju Menon, Serena Wahab, Reena Basheer, Shilpa Bala, Innocent, Valsala M
DVD Features: Anamorphic Widescreen, Dolby Digital ® 5.1  Surround, English Subtitles, NTSC All Regions
Director: Kamal
Banner: Via Media Entertainment
Producers: Mathew Joseph and Rafi Methar
Music: Ouseppachan
Lyrics: Kaithapram
Script and Dialogues: Kamal and Kalavoor Ravikumar

Aagathan begins in a flashback mode in Kashmir where a ten year old boy Goutham loses his family in a terrorist attack. Gautham (Dileep) is now grownup and the CEO of a software company in Bangalore. On his journey to Bangalore, he meets a management student Shreya (Charmi) in the bus and strikes up a pleasant conversation with her.

Though she hates him initially, she soon falls in love with him. She takes him to their house to meet her parents Retd. Gen. Hardeendra Varma (Sathyaraj) and Malathi Thampuratti (Zareena Wahab). Everyone in the family is happy with Gautham and agrees to his marriage with Shreya. But soon, we see that Gautham has done it all deliberately to seek revenge! "Why and how" forms the rest of the film.