Postman - Season 1 Episode 5 Kettavangalukku Neraya Koduppan Aana Kai Vittuduvaan

Twenty-three years ago, before Raja became unconscious, Sameer and Vidya had applied for a divorce, leaving their son with Vidya's brother Dr. Vishwa. Later, their son died of a seizure attack. When Raja meets Sameer after he regains his consciousness and hands him the pending letter, Sameer realises that it's from his son. He goes into a state of shock after reading it.