4 reasons you should watch this - Amitabh Bachchan, Nawazuddin Siddiqui, Vidya Balan and finally this is the Hindi remake of only one of the best Korean non-derivative thrillers in recent years called Montage that not many people even know about.
If you have seen Hindi remakes you would know they can often surprise you with a new spin on familiar proceedings. We already know how everything would pan out but we were still kept spellbound. A good movie.