There were a few people in the park. A little girl was sitting on one of the benches. She wanted to rest and think. But sadness is apparent in her beautiful face. A tall young man passed by the bench where this girl was sitting. Behind him was a boy carrying a schoolbag. The man looked at the girl. Suddenly her face turned red .. The girl pretended not to recognize him. The man sat on a bench fifty meters away from her. He stopped the boy and asked him to take a letter to the girl. So the boy became a random courier.. A courier can change the fate of two people.