In the first episode of Black Mirror season 6, the main character is not quite who she seems to be, and in this way, sets off a series of strange happenings and even stranger questions. "Joan Is Awful" stars Schitt's Creek's Annie Murphy as Joan, a woman with a put-together life that no longer excites her. However, one night everything turns upside down as she discovers that a streaming service has created a new show entitled "Joan Is Awful," and it's unmistakably about her life, yet worse. With just one episode sending her into a spiral, Joan goes on a mission to get this show taken down at whatever cost.

https://screenrant.com/black-mirror-joan-is-awful-actors-inception-explained/