<How do I get data for cast in movie details> I am...

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How do I get data for cast in movie details
I am creating a movie app. Whenever a user clicks on a movie, I want him to be able to see the cast as part of the movie details. However I am having a little issue where the cast is not displaying.
This is the UI data
data class UIMovieDetails(
val id:Int,
val name:String,
val Description:String
val cast: List
)

This UIMovieDetails is mapped to my Domain layer where it is been fed with data. However cast is not fed with any data. Even though the data is there in the domain.
For my use cases...