Movie class with multiple constructors

Movie.cs

public class Movie(string title, List<string> genres)
{
    public string Title { get; } = title;
 
    public List<string> Genres { get; } = genres;
 
    public int Runtime { get; private set; }
 
    public Movie(string title, List<string> genres, int runtime) : this(title, genres)
    {
        Runtime = runtime;
    }
}