1. The viewing order of the "Fifty Degrees" series is: the first part is "Fifty Degrees Gray", the second part is "Fifty Degrees Black", and the third part is "Fifty Degrees Fly".

2. "Fifty Shades of Grey" is a romantic film directed by Sam Taylor-Johnson and starring Jamie Dornan, Dakota Johnson, Luke Grimes, Victor Rosek and others. It was released in the United States on February 13, 2015. The film is adapted from the novel of the same name written by British female writer EL James. It tells the story of an innocent female college student Anathaya Sdill interviewing entrepreneur Christian Gray and getting to know her.

3. "Fifty Degrees of Black" is a romance film produced by Universal Pictures. It is directed by James Frey and starred by Dakota Johnson and James Donan. The film was released in the United States on February 10, 2017. The film tells the story of Grey hoping that Anna will return to him, and Anna is no longer passively accepting it, and she also makes her own request. Just as the two re-entered their relationship, what happened in Gray's past life shrouded over their heads like a shadow.

4. "Fifty Degrees" is a romance film directed by James Frey and starring Dakota Johnson and James Donan. It was released in the United States on February 9, 2018. The film tells the story of Anna and Christian Gray finally entering the marriage hall, their relationship faces more tests, and Anna's former boss Jack is also waiting for an opportunity to take revenge.