Question: Who directed the 2017 American erotic romantic drama based on E. L. James's novel that is the sequel to a 2015 American erotic romantic drama film directed by Sam Taylor-Johnson about a college graduate who begins a sadomasochistic relationship with young business magnate ? 
Sentence (from "Fifty Shades Darker (film)"): The second film in the "Fifty Shades" film series, it is the sequel to the 2015 film "Fifty Shades of Grey".
Relevant evidence: No