Can't display data from related tables in View?

Question

ASP.NET

Hello! There are two related tables based on SQL Server.
1 - "Kolledjs": ID - primary key, RUNAME,RUADRES....
2nd table "Spess": ID-primary key, KolledjId (for foreign key of Kolledjs table), RUSPES...
I want to display in view from table , but nothing comes out, a blank page

When choosing a college, the specialty of the college should be displayed
Actually the model itself:

namespace Abit.Models
{
    public class Spes
    {
        public int Id { get; set; }
        public int? KolledjId { get; set; }
       public Kolledj Kolledj { get; set; }
        public string RUSPES { get; set; }
        public string RUKVAL { get; set; }
    }
    public class Kolledj
    {
        public int ID { get; set; }
        public string RUNAME { get; set; }
        public string RUADRES { get; set; }
        public string KAT { get; set; }
        public int RAITING { get; set; }
        public string TELEFONSITE { get; set; }
        public ICollection<Spes> Spess { get; set; }
        public Kolledj()
        {
            Spess = new List<Spes>();
        }
    }
}

Context:

namespace Abit.Models
{
    public class KContext:DbContext
    {
        public DbSet<Spes> Spess { get; set; }
        public DbSet<Kolledj> Kolledjs { get; set; }
    }
}

Controller

public class HomeController : Controller
{
 KContext db = new KContext();
 public ActionResult Index()
 {
 var sp = db.Spess.Include(s => s.Kolledj);
 return View(sp.ToList());
 }
}
public ActionResult Details(int? id)
{
 var sp= db.Spess.Include(s => s.Kolledj).FirstOrDefault(s => s.Id == id);
 if (sp== null)
 {
 return HttpNotFound();
 }
 return View(sp);
}

Where am I doing wrong?
And how can it be done differently? For example, as in the picture, selects a college, and next to it in the table, the specialty of the selected college is loaded