Shaktivel has to attend an interview that morning. A minor obstacle at the bus stop makes him miss the bus (12B) literally and otherwise. That should justify the title. Parthiban's voice in the background tells you that henceforth will unfold two versions what would have happened to Shakti if he had been in time for the interview and also what happens because he is late. So for all practical purposes there are two Shaktis interacting with the same people in both.