Do you want to know why Shankar insists on keeping the story a secret?

Because it is an open secret.

http://www.indiaglitz.com/channels/tamil/review/7911.html

Read the above link you will know why? My opinion after reading the review is  ‘Aracha Maava Araipomaa?, Thovacha Thuniya Thovaipomaa?’.The writer has used such rich language that it took him nearly 5 paragraphs to really talk about the movie.Hmm… I will write my review after watching the movie!

On a side note you are likely to remember that there is a director named Vikraman. Most of his assistants started making films exactly like him because they learnt the secret reciepe to make a ’Vikraman’ film. Now both the director and assistants are out of market. I just hope that Shankar’s assistant won’t follow the same track.