His dad saved a little girl in a fire, but he lost his life.
Mahdi had so much to tell his dad — he’s taking care of himself properly, he can tie his own shoelaces, and he was the top student in class. He wished dad was there with him.
At his father’s grave, he sees a man with a child, playing with a balloon. He writes a letter to his father, attached to a balloon.
To his surprise, the letter returns with many praises.
Dad was there with him, all along, all the time.