Who is the person predicted in Harry Potter?

The prophecy in Harry Potter is Professor Trelawney, a divination teacher, who predicted to Voldemort that only one child (Voldemort) born at the end of July would survive. That's what she said. In fact, Dumbledore didn't want to hire Trelawney at first, but the prediction made by Professor Trelawney happened to be heard by Severus, Voldemort's subordinate. He told it to the person you know, and later learned. The mystery man wants to kill the girl Severus secretly loves, Lily Evans, James Potter's children and themselves. Finally Severus is willing to be the undercover of the mysterious man, secretly protecting Harry and making the mysterious man think that he is Dumbledore's undercover, that is, Mission Impossible.