diff --git a/pydictable/core.py b/pydictable/core.py
index 3ba6084..c0bd343 100644
--- a/pydictable/core.py
+++ b/pydictable/core.py
@@ -1,7 +1,8 @@
 import inspect
 from datetime import datetime
 from enum import Enum
-from typing import Dict, get_type_hints, Optional, Union, List
+from itertools import chain
+from typing import Dict, get_type_hints, Union
 
 from pydictable.field import StrField, IntField, FloatField, BoolField, ListField, MultiTypeField, UnionField, \
     NoneField, ObjectField, DataValidationError, EnumField, DatetimeField
@@ -70,8 +71,14 @@ def __clear_default_field_values(self):
             self.__setattr__(attr, None)
 
     def __apply_dict(self, d: dict):
-        for attr, field in self.__class__.__get_fields().items():
-            self.__setattr__(attr, field.from_dict(d.get(self.__get_field_key(attr), field.default)))
+        _updated_attributes = []
+        for attr, field in chain(self.__class__.__get_fields().items(), d.items()):
+            if isinstance(field, Field):
+                self.__setattr__(attr, field.from_dict(d.get(self.__get_field_key(attr), field.default)))
+                _updated_attributes.append(self.__get_field_key(attr))
+                continue
+            if attr not in _updated_attributes:
+                self.__setattr__(attr, field)
 
     def __validate_dict(self, raw_values: dict):
         for attr, field in self.__get_fields().items():
@@ -102,8 +109,14 @@ def __validate(self):
 
     def to_dict(self) -> dict:
         d = {}
-        for attr, field in self.__class__.__get_fields().items():
-            d[self.__get_field_key(attr)] = field.to_dict(self.__getattribute__(attr))
+        _updated_attributes = []
+        for attr, field in chain(self.__class__.__get_fields().items(), self.__dict__.items()):
+            if isinstance(field, Field):
+                d[self.__get_field_key(attr)] = field.to_dict(self.__getattribute__(attr))
+                _updated_attributes.append(attr)
+                continue
+            if attr not in _updated_attributes:
+                d[attr] = field
         return d
 
     @classmethod
diff --git a/pydictable/test_core.py b/pydictable/test_core.py
index 1c429c6..bb75072 100644
--- a/pydictable/test_core.py
+++ b/pydictable/test_core.py
@@ -658,3 +658,29 @@ class UserInfo(DictAble):
             UserInfo(dict={'dob': 1673442076263})
         except DataValidationError as e:
             self.assertEqual(e.err, 'Pre check failed: Invalid value 123 for field name')
+
+    def test_return_all_input_dict_fields(self):
+        class Address(DictAble):
+            pin_code: int = IntField(default=560090)
+            street: str = StrField()
+
+        input_dict = {'street': 'RT Nagar', 'city': 'Bengaluru'}
+        address = Address(dict=input_dict)
+        self.assertEqual(address.pin_code, 560090)
+        self.assertEqual(address.street, 'RT Nagar')
+        self.assertEqual(address.city, 'Bengaluru')
+        self.assertEqual(len(address.to_dict()), 3)
+
+        class Email(DictAble):
+            to: str = StrField(required=True, key='to_email')
+            subject: str = StrField(required=True, default="General inquiry")
+            body: str = StrField(required=True)
+
+        input_dict = {'to_email': 'testing@gmail.com', 'body': 'Hello', 'cc': 'testing1@gmail.com', 'bcc': 't@test.com'}
+        email = Email(dict=input_dict)
+        self.assertEqual(email.to, 'testing@gmail.com')
+        self.assertEqual(email.subject, 'General inquiry')
+        self.assertEqual(email.body, 'Hello')
+        self.assertEqual(email.cc, 'testing1@gmail.com')
+        self.assertEqual(email.bcc, 't@test.com')
+        self.assertEqual(len(email.to_dict()), 5)