Ink Sea.

A young sailor Sasha travels the world and sends letters to his father from every city where the ship stops. But all his letters remain unanswered for many years. Since childhood, Sasha has not seen his father, he does not have his phone, only the postal address has been preserved. For him, one-way letters have already become a ritual. But one day, returning home from a voyage, a sailor finds a reply letter in his mailbox.