Value error. model field must be an instance django

I want to save a list of the relational objects using IDs but unfortunately, I'm getting an error from Django which I attached below.

error:

Cannot assign "[<Tag: Tag object (189)>, <Tag: Tag object (190)>]": 
"PackageRoom.tag" must be a "Tag" instance.

models.py

class Tag(models.Model):
    name = models.CharField(max_length=255, default='')
    description = models.CharField(max_length=255, default='')
    singleline = models.ManyToManyField(Singleline)

    class Meta:
        db_table = 'tags'



class PackageRoom(models.Model):
    name = models.CharField(max_length=255, default='')
    tag = models.ForeignKey(Tag, on_delete=models.PROTECT) 

    class Meta:
        db_table = 'package_rooms'

serializers.py

class PackageRoomSerializer(serializers.ModelSerializer):
    tag = serializers.PrimaryKeyRelatedField(queryset=Tag.objects.all(), many=True)
    class Meta:
        model = PackageRoom
        fields = ['id', 'name', 'description', 'tag']

views.py

serializer = PackageRoomSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        serializer.save()

JSON object which is sent from Frontend:

{
   "name": "example room", 
   "description": "lorem lipsum",
   "tag": [189, 190]
}

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