diff --git a/Kyoo.Common/Kyoo.Common.csproj b/Kyoo.Common/Kyoo.Common.csproj
index ac43b9a0..b24abadc 100644
--- a/Kyoo.Common/Kyoo.Common.csproj
+++ b/Kyoo.Common/Kyoo.Common.csproj
@@ -16,7 +16,6 @@
 
 	<ItemGroup>
 	  <PackageReference Include="JetBrains.Annotations" Version="2020.1.0" />
-	  <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
 	</ItemGroup>
 
 </Project>
diff --git a/Kyoo.Common/Models/Attributes/MergeAttributes.cs b/Kyoo.Common/Models/Attributes/MergeAttributes.cs
index 399f5389..1944c89b 100644
--- a/Kyoo.Common/Models/Attributes/MergeAttributes.cs
+++ b/Kyoo.Common/Models/Attributes/MergeAttributes.cs
@@ -8,4 +8,7 @@ namespace Kyoo.Models.Attributes
 	{
 		void OnMerge(object merged);
 	}
+	
+	public class JsonReadOnly : Attribute { }
+	public class JsonIgnore : JsonReadOnly { }
 }
\ No newline at end of file
diff --git a/Kyoo.Common/Models/MetadataID.cs b/Kyoo.Common/Models/MetadataID.cs
index 649ec157..945e578b 100644
--- a/Kyoo.Common/Models/MetadataID.cs
+++ b/Kyoo.Common/Models/MetadataID.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/PeopleRole.cs b/Kyoo.Common/Models/PeopleRole.cs
index 678ae7e7..54fe48cb 100644
--- a/Kyoo.Common/Models/PeopleRole.cs
+++ b/Kyoo.Common/Models/PeopleRole.cs
@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Collection.cs b/Kyoo.Common/Models/Resources/Collection.cs
index bfe02e7b..2e8c85bc 100644
--- a/Kyoo.Common/Models/Resources/Collection.cs
+++ b/Kyoo.Common/Models/Resources/Collection.cs
@@ -1,5 +1,5 @@
-using Newtonsoft.Json;
-using System.Collections.Generic;
+using System.Collections.Generic;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Episode.cs b/Kyoo.Common/Models/Resources/Episode.cs
index f32a03ef..79229631 100644
--- a/Kyoo.Common/Models/Resources/Episode.cs
+++ b/Kyoo.Common/Models/Resources/Episode.cs
@@ -1,5 +1,4 @@
-using Newtonsoft.Json;
-using System;
+using System;
 using System.Collections.Generic;
 using Kyoo.Models.Attributes;
 
diff --git a/Kyoo.Common/Models/Resources/Genre.cs b/Kyoo.Common/Models/Resources/Genre.cs
index 3b34abb0..947a2866 100644
--- a/Kyoo.Common/Models/Resources/Genre.cs
+++ b/Kyoo.Common/Models/Resources/Genre.cs
@@ -1,5 +1,5 @@
 using System.Collections.Generic;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Library.cs b/Kyoo.Common/Models/Resources/Library.cs
index 80f8d0ef..dfb17da7 100644
--- a/Kyoo.Common/Models/Resources/Library.cs
+++ b/Kyoo.Common/Models/Resources/Library.cs
@@ -1,5 +1,5 @@
 using System.Collections.Generic;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/People.cs b/Kyoo.Common/Models/Resources/People.cs
index 8a97a918..44c1ad63 100644
--- a/Kyoo.Common/Models/Resources/People.cs
+++ b/Kyoo.Common/Models/Resources/People.cs
@@ -1,6 +1,5 @@
 using System.Collections.Generic;
-using System.Linq;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
@@ -12,7 +11,7 @@ namespace Kyoo.Models
 		public string Poster { get; set; }
 		public virtual IEnumerable<MetadataID> ExternalIDs { get; set; }
 		
-		[JsonIgnore] public virtual IEnumerable<PeopleRole> Roles { get; set; }
+		[JsonReadOnly] public virtual IEnumerable<PeopleRole> Roles { get; set; }
 		
 		public People() {}
 
diff --git a/Kyoo.Common/Models/Resources/ProviderID.cs b/Kyoo.Common/Models/Resources/ProviderID.cs
index 387376fa..49e19774 100644
--- a/Kyoo.Common/Models/Resources/ProviderID.cs
+++ b/Kyoo.Common/Models/Resources/ProviderID.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Season.cs b/Kyoo.Common/Models/Resources/Season.cs
index 761fa2af..b0deac23 100644
--- a/Kyoo.Common/Models/Resources/Season.cs
+++ b/Kyoo.Common/Models/Resources/Season.cs
@@ -1,5 +1,5 @@
 using System.Collections.Generic;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Show.cs b/Kyoo.Common/Models/Resources/Show.cs
index 1f519c38..4e1705c1 100644
--- a/Kyoo.Common/Models/Resources/Show.cs
+++ b/Kyoo.Common/Models/Resources/Show.cs
@@ -1,5 +1,4 @@
-using Newtonsoft.Json;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using Kyoo.Models.Attributes;
 
@@ -29,9 +28,9 @@ namespace Kyoo.Models
 		
 		
 		[JsonIgnore] public int? StudioID { get; set; }
-		[JsonIgnore] public virtual Studio Studio { get; set; }
-		[JsonIgnore] public virtual IEnumerable<Genre> Genres { get; set; }
-		[JsonIgnore] public virtual IEnumerable<PeopleRole> People { get; set; }
+		[JsonReadOnly] public virtual Studio Studio { get; set; }
+		[JsonReadOnly] public virtual IEnumerable<Genre> Genres { get; set; }
+		[JsonReadOnly] public virtual IEnumerable<PeopleRole> People { get; set; }
 		[JsonIgnore] public virtual IEnumerable<Season> Seasons { get; set; }
 		[JsonIgnore] public virtual IEnumerable<Episode> Episodes { get; set; }
 		[JsonIgnore] public virtual IEnumerable<Library> Libraries { get; set; }
diff --git a/Kyoo.Common/Models/Resources/Studio.cs b/Kyoo.Common/Models/Resources/Studio.cs
index a101c394..1bbb6014 100644
--- a/Kyoo.Common/Models/Resources/Studio.cs
+++ b/Kyoo.Common/Models/Resources/Studio.cs
@@ -1,5 +1,5 @@
 using System.Collections.Generic;
-using Newtonsoft.Json;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/Resources/Track.cs b/Kyoo.Common/Models/Resources/Track.cs
index 486c684a..62e4792a 100644
--- a/Kyoo.Common/Models/Resources/Track.cs
+++ b/Kyoo.Common/Models/Resources/Track.cs
@@ -1,8 +1,8 @@
 using Kyoo.Models.Watch;
-using Newtonsoft.Json;
 using System.Globalization;
 using System.Linq;
 using System.Runtime.InteropServices;
+using Kyoo.Models.Attributes;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo.Common/Models/WatchItem.cs b/Kyoo.Common/Models/WatchItem.cs
index 40b03c16..a86f5490 100644
--- a/Kyoo.Common/Models/WatchItem.cs
+++ b/Kyoo.Common/Models/WatchItem.cs
@@ -1,10 +1,10 @@
-using Newtonsoft.Json;
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using Kyoo.Controllers;
+using Kyoo.Models.Attributes;
 using Kyoo.Models.Watch;
 using PathIO = System.IO.Path;
 
diff --git a/Kyoo.Common/Utility.cs b/Kyoo.Common/Utility.cs
index ee978f43..4aa13f0f 100644
--- a/Kyoo.Common/Utility.cs
+++ b/Kyoo.Common/Utility.cs
@@ -112,9 +112,13 @@ namespace Kyoo
 				object defaultValue = property.PropertyType.IsValueType
 					? Activator.CreateInstance(property.PropertyType) 
 					: null;
-				
+
 				if (value?.Equals(defaultValue) == false)
+				{
+					if (value is IEnumerable enumerable && !(value is string))
+						value = RunGenericMethod(typeof(Enumerable), "ToList", GetEnumerableType(enumerable), value);
 					property.SetValue(first, value);
+				}
 			}
 
 			if (first is IOnMerge merge)
diff --git a/Kyoo.CommonAPI/JsonSerializer.cs b/Kyoo.CommonAPI/JsonSerializer.cs
index 829475c3..4e0c6bbe 100644
--- a/Kyoo.CommonAPI/JsonSerializer.cs
+++ b/Kyoo.CommonAPI/JsonSerializer.cs
@@ -3,11 +3,11 @@ using System.Buffers;
 using System.Collections.Generic;
 using System.Reflection;
 using Kyoo.Models;
+using Kyoo.Models.Attributes;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.AspNetCore.Mvc.Formatters;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
 
@@ -24,7 +24,8 @@ namespace Kyoo.Controllers
 			_forceSerialize = new Dictionary<Type, HashSet<string>>();
 		}
 		
-		public JsonPropertySelector(Dictionary<Type, HashSet<string>> ignored, Dictionary<Type, HashSet<string>> forceSerialize)
+		public JsonPropertySelector(Dictionary<Type, HashSet<string>> ignored, 
+			Dictionary<Type, HashSet<string>> forceSerialize = null)
 		{
 			_ignored = ignored ?? new Dictionary<Type, HashSet<string>>();
 			_forceSerialize = forceSerialize ?? new Dictionary<Type, HashSet<string>>();
@@ -58,15 +59,20 @@ namespace Kyoo.Controllers
 		{
 			JsonProperty property = base.CreateProperty(member, memberSerialization);
 
-			if (IsIgnored(property.DeclaringType, property.PropertyName))
+			if (IsSerializationForced(property.DeclaringType, property.PropertyName))
+			{
+				property.ShouldSerialize = i => true;
+				property.Ignored = false;
+			}
+			else if (IsIgnored(property.DeclaringType, property.PropertyName))
 			{
 				property.ShouldSerialize = i => false;
 				property.Ignored = true;
 			}
-			else if (IsSerializationForced(property.DeclaringType, property.PropertyName))
+			else
 			{
-				property.ShouldSerialize = i => true;
-				property.Ignored = false;
+				property.ShouldSerialize = i => member.GetCustomAttribute<JsonReadOnly>(true) == null;
+				property.ShouldDeserialize = i => member.GetCustomAttribute<JsonIgnore>(true) == null;
 			}
 			return property;
 		}
@@ -89,7 +95,7 @@ namespace Kyoo.Controllers
 						})
 					},
 				context.HttpContext.RequestServices.GetRequiredService<ArrayPool<char>>(), 
-					context.HttpContext.RequestServices.GetRequiredService<IOptions<MvcOptions>>().Value));
+					new MvcOptions()));
 			}
 		}
 	}
diff --git a/Kyoo.CommonAPI/LocalRepository.cs b/Kyoo.CommonAPI/LocalRepository.cs
index f7876131..b06b4f01 100644
--- a/Kyoo.CommonAPI/LocalRepository.cs
+++ b/Kyoo.CommonAPI/LocalRepository.cs
@@ -10,6 +10,7 @@ using Kyoo.CommonApi;
 using Kyoo.Models;
 using Kyoo.Models.Exceptions;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
 
 namespace Kyoo.Controllers
 {
@@ -142,18 +143,30 @@ namespace Kyoo.Controllers
 		{
 			if (edited == null)
 				throw new ArgumentNullException(nameof(edited));
-			
-			T old = await Get(edited.Slug);
 
-			if (old == null)
-				throw new ItemNotFound($"No resource found with the slug {edited.Slug}.");
-			
-			if (resetOld)
-				Utility.Nullify(old);
-			Utility.Merge(old, edited);
-			await Validate(old);
-			await Database.SaveChangesAsync();
-			return old;
+			Database.ChangeTracker.LazyLoadingEnabled = false;
+			try
+			{
+				T old = await Get(edited.ID);
+
+				if (old == null)
+					throw new ItemNotFound($"No resource found with the ID {edited.ID}.");
+
+				if (resetOld)
+					Utility.Nullify(old);
+				Utility.Complete(old, edited);
+				await Validate(old);
+				// TODO should fix this, new links & deleted links should be kept.
+				// TODO The changetracker has trash values now & values can't be listed before the validation (exception is thrown)
+				foreach (EntityEntry x in Database.ChangeTracker.Entries().Where(x => x.Entity != old))
+					x.State = EntityState.Detached;
+				await Database.SaveChangesAsync();
+				return old;
+			}
+			finally
+			{
+				Database.ChangeTracker.LazyLoadingEnabled = true;
+			}
 		}
 		
 		protected virtual Task Validate(T resource)
diff --git a/Kyoo/Kyoo.csproj b/Kyoo/Kyoo.csproj
index 76fff030..32b3148f 100644
--- a/Kyoo/Kyoo.csproj
+++ b/Kyoo/Kyoo.csproj
@@ -16,6 +16,7 @@
 		<Authors>Anonymus-Raccoon</Authors>
 		<RepositoryUrl>https://github.com/AnonymusRaccoon/Kyoo</RepositoryUrl>
 		<StartupObject>Kyoo.Program</StartupObject>
+		<LangVersion>default</LangVersion>
 	</PropertyGroup>
 
 	<ItemGroup>
diff --git a/Kyoo/Models/Resources/CollectionDE.cs b/Kyoo/Models/Resources/CollectionDE.cs
index 8cafc83f..3f330c26 100644
--- a/Kyoo/Models/Resources/CollectionDE.cs
+++ b/Kyoo/Models/Resources/CollectionDE.cs
@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Kyoo.Models.Attributes;
-using Newtonsoft.Json;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo/Models/Resources/GenreDE.cs b/Kyoo/Models/Resources/GenreDE.cs
index 03443d66..fa44e3b5 100644
--- a/Kyoo/Models/Resources/GenreDE.cs
+++ b/Kyoo/Models/Resources/GenreDE.cs
@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Kyoo.Models.Attributes;
-using Newtonsoft.Json;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo/Models/Resources/LibraryDE.cs b/Kyoo/Models/Resources/LibraryDE.cs
index 3ddc6cd6..f2521904 100644
--- a/Kyoo/Models/Resources/LibraryDE.cs
+++ b/Kyoo/Models/Resources/LibraryDE.cs
@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Kyoo.Models.Attributes;
-using Newtonsoft.Json;
 
 namespace Kyoo.Models
 {
diff --git a/Kyoo/Models/Resources/ShowDE.cs b/Kyoo/Models/Resources/ShowDE.cs
index 31d68100..010b33f6 100644
--- a/Kyoo/Models/Resources/ShowDE.cs
+++ b/Kyoo/Models/Resources/ShowDE.cs
@@ -1,16 +1,12 @@
 using System.Collections.Generic;
 using System.Linq;
 using Kyoo.Models.Attributes;
-using Newtonsoft.Json;
-
-
-// TODO Remove every [JsonIgnore] tag from here once the serializer knows which property should be serialized.
 
 namespace Kyoo.Models
 {
 	public class ShowDE : Show
 	{
-		[JsonIgnore] [NotMergable] public virtual ICollection<GenreLink> GenreLinks { get; set; }
+		[JsonReadOnly] [NotMergable] public virtual ICollection<GenreLink> GenreLinks { get; set; }
 		[ExpressionRewrite(nameof(GenreLinks), nameof(GenreLink.Genre))]
 		public override IEnumerable<Genre> Genres
 		{
@@ -18,7 +14,7 @@ namespace Kyoo.Models
 			set => GenreLinks = value?.Select(x => new GenreLink(this, x)).ToList();
 		}
 		
-		[JsonIgnore] [NotMergable] public virtual ICollection<LibraryLink> LibraryLinks { get; set; }
+		[JsonReadOnly] [NotMergable] public virtual ICollection<LibraryLink> LibraryLinks { get; set; }
 		[ExpressionRewrite(nameof(LibraryLinks), nameof(LibraryLink.Library))]
 		public override IEnumerable<Library> Libraries
 		{
@@ -26,7 +22,7 @@ namespace Kyoo.Models
 			set => LibraryLinks = value?.Select(x => new LibraryLink(x, this)).ToList();
 		}
 		
-		[JsonIgnore] [NotMergable] public virtual ICollection<CollectionLink> CollectionLinks { get; set; }
+		[JsonReadOnly] [NotMergable] public virtual ICollection<CollectionLink> CollectionLinks { get; set; }
 		[ExpressionRewrite(nameof(CollectionLinks), nameof(CollectionLink.Collection))]
 		public override IEnumerable<Collection> Collections
 		{
diff --git a/Kyoo/Program.cs b/Kyoo/Program.cs
index f04f5f57..dfda8f1e 100644
--- a/Kyoo/Program.cs
+++ b/Kyoo/Program.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
diff --git a/Kyoo/Startup.cs b/Kyoo/Startup.cs
index 7c30527b..4e6cc6e5 100644
--- a/Kyoo/Startup.cs
+++ b/Kyoo/Startup.cs
@@ -40,7 +40,8 @@ namespace Kyoo
 				configuration.RootPath = "wwwroot";
 			});
 
-			services.AddControllers().AddNewtonsoftJson();
+			services.AddControllers()
+				.AddNewtonsoftJson(x => x.SerializerSettings.ContractResolver = new JsonPropertySelector());
 			services.AddHttpClient();
 
 			services.AddDbContext<DatabaseContext>(options =>
diff --git a/Kyoo/Views/WebClient b/Kyoo/Views/WebClient
index 42af654d..f2ee4854 160000
--- a/Kyoo/Views/WebClient
+++ b/Kyoo/Views/WebClient
@@ -1 +1 @@
-Subproject commit 42af654da4f4ec45945336e6f1085d9bda8ed773
+Subproject commit f2ee4854ab7531cb8cf38ed9fd3d2b97d1d04a97