Kannum Kannum Kollaiyadithaal is a winsome romantic thriller with charming leads and edge-of-the-seat moments. Desingh Periyasamy displays a flair for this material both in his writing and making. Though his premise isn’t new, he manages to inject freshness into the scenes with clever writing. Take Kallis. He initially seems like just another wisecracking friend that we come across in our films, but the director gradually turns him into a parallel lead who is used to effectively lighten up the heavier scenes.