Isai begins with a voice-over that tells us the film will show us what jealousy can do to a genius. And it dives straight into the plot. AK Shiva is the new hotshot film composer in town and the man he has dethroned, Vetrichelvan, who was ruling the scene for 30 years, is enraged by his success. He is the Mozart to Vetrichelvan's Salieri. Earlier in the film, we get a scene that is similar to the one in Pudhu Pudhu Arthangal — Vetrichelvan is signing autographs but when Shiva turns up, the fans rush to him leaving him all alone. The man is so consumed by rage that he goes and murders the direc...