T D Dasan is a young boy who lives with his mother. His father had left them a few years back. Dasan gets his dad's address from his mother's old trunk box and writes him a letter. Dasan's father had moved out of that address and the letter reaches the current resident Nandakumar Poduval, an Ad film maker who lives with his 13-year-old daughter.
Ammu sees the letter and starts writing replies to Dasan, as if they were written to him by his dad. The young boy is excited at the thought of having found his dad, but things take some dramatic turns soon after.