Willie gets cursed by Caleb and the boys guess that Julie was able to save them because she was who brought them back, so in order to save Willie they have to find whoever brought him back and they spend most of the season looking for this person, but Willie has his hopes on the floor because he's been a ghost since the 80's so chances are high this person is long gone. Alex tries to stay positive for them both but as time starts running out and they still have nothing it becomes harder. Then in the climax, time's up and Alex is holding Willie as he becomes weaker, and before he goes he tells him he loves him and right after the stamp fades away, and there's this realization that Julie herself didn't save the boys, it was her love for them and so what saves Willie is Alex's love for him and oh god them