Postman

Season 1, Episode 5: Kettavangalukku Neraya Koduppan Aana Kai Vittuduvaan

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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.