Felix was a ghost, he wasn't alive, and only you saw him, he could choose the people who would have the ability to see him, and he chose you, only you, he noticed that someone had bought the house next to the one he inhabited, he soon aroused an interest in him. He won't tell you this easily, it will take time and you will have many doubts, where did he come from? how is this possible? Why are you the only one who sees him? you will find out.