Wached the movie and u can't ignore but notice from the very first scene that Shahid Kapoor in every scene is trying to impress with his screen presence. Irritating after a point. The screenplay was jumping all over the place in a non-linear confusing way. Yet, director was able to hold it together somehow as the story is interesting. Unlike most hindi movies, it had a story, making one curious, what is in store, what will be the twist. And behold, it had a twist that is very interesting and u admire it for originality. But wait, bollywood movie and originality? So you start wondering is it a lift-off from a Korean movie ! So you search in google and there it is. Original is a Malayalam movie. Even the director is the same.
Now you have to watch the original as the Bollywood version is left with a promise, lot of missed opportunities to make a good movie, kind of spoiling a good story and made into a "hero" Shahid movie. And behold, the original has a great screenplay, wonderful acting by prithviraj and u watch it like a all new gripping movie.
So when you watch the original, all you feel is pity for Bollywood. Just that it is bollywood and its hero culture, style without substance (similar to many telegu movies) formula, overall lack of talent in the mainstream that a good story like this from a malayalam movie by the same director is spoiled into a mediocre one.
Morale of Deva, you give a good movie to bollywood and they will ensure it is made it in to an average one. Drishyam may be the only two movies made reasonably well by copying scene to scene. That's the only way.