diff --git a/neispy/client.py b/neispy/client.py
index a947ffa..7df986a 100644
--- a/neispy/client.py
+++ b/neispy/client.py
@@ -48,8 +48,8 @@ def sync(
         KEY: Optional[str] = None,
         pIndex: int = 1,
         pSize: int = 100,
-    ) -> SyncNeispy:
-        return cast(SyncNeispy, super().sync(KEY, pIndex, pSize))
+    ) -> "SyncNeispy":
+        return cast("SyncNeispy", super().sync(KEY, pIndex, pSize))
 
     async def schoolInfo(
         self,
diff --git a/neispy/domain/classinfo.py b/neispy/domain/classinfo.py
index d451f16..a76d5bf 100644
--- a/neispy/domain/classinfo.py
+++ b/neispy/domain/classinfo.py
@@ -13,12 +13,18 @@ class ClassInfoRow(SchoolRelated):
     "학년도"
     GRADE: str
     "학년"
-    CLASS_NM: str
-    "학급명"
-    DDDEP_NM: str
-    "학과명"
+    DGHT_CRSE_SC_NM: str
+    "주야과정명"
     SCHUL_CRSE_SC_NM: str
     "학교과정명"
+    ORD_SC_NM: str
+    "계열명"
+    DDDEP_NM: str
+    "학과명"
+    CLASS_NM: str
+    "학급명"
+    LOAD_DTM: str
+    "수정일"
 
 
 @dataclass
diff --git a/neispy/domain/schoolmajorinfo.py b/neispy/domain/schoolmajorinfo.py
index ac6f20f..cb0588c 100644
--- a/neispy/domain/schoolmajorinfo.py
+++ b/neispy/domain/schoolmajorinfo.py
@@ -21,7 +21,7 @@ class SchoolMajorInfoRow(SchoolRelated):
 
 @dataclass
 class SchoolMajorInfo(Deserializer):
-    schoolMajorInfo: NeisObject[SchoolMajorInfoRow]
+    schoolMajorinfo: NeisObject[SchoolMajorInfoRow]
 
     @classmethod
     def from_dict(cls, d: SchoolMajorInfoDict) -> SchoolMajorInfo:
diff --git a/neispy/domain/schoolschedule.py b/neispy/domain/schoolschedule.py
index 69b7c12..5eecf9d 100644
--- a/neispy/domain/schoolschedule.py
+++ b/neispy/domain/schoolschedule.py
@@ -48,6 +48,3 @@ def from_dict(
         cls, d: SchoolScheduleDict
     ) -> SchoolSchedule:  # type: ignore[valid-type]
         return super().from_dict(d)
-
-
-SchoolSchedule.SchoolSchedule[1].row[0].AY
diff --git a/neispy/domain/schulaflcoinfo.py b/neispy/domain/schulaflcoinfo.py
index bf31df8..4988d7a 100644
--- a/neispy/domain/schulaflcoinfo.py
+++ b/neispy/domain/schulaflcoinfo.py
@@ -19,7 +19,7 @@ class SchulAflcoInfoRow(SchoolRelated):
 
 @dataclass
 class SchulAflcoInfo(Deserializer):
-    schulAflcoInfo: NeisObject[SchulAflcoInfoRow]
+    schulAflcoinfo: NeisObject[SchulAflcoInfoRow]
 
     @classmethod
     def from_dict(cls, d: SchulAflcoInfoDict) -> SchulAflcoInfo:
diff --git a/neispy/http.py b/neispy/http.py
index c7e7f4c..abc1559 100644
--- a/neispy/http.py
+++ b/neispy/http.py
@@ -48,7 +48,7 @@ def sync(
         KEY: Optional[str],
         pIndex: int,
         pSize: int,
-    ) -> SyncNeispyRequest:
+    ) -> "SyncNeispyRequest":
         http = cls(KEY, pIndex, pSize, None)
         origin_request_func = getattr(http, "request")
         loop = get_event_loop()
@@ -95,7 +95,7 @@ def dont_use_sync(*args: Any, **kwargs: Any) -> NoReturn:
             http.__setattr__(method, to_sync_func(getattr(http, method)))
 
         setattr(http.__class__, "sync", property(dont_use_sync))
-        return cast(SyncNeispyRequest, http)
+        return cast("SyncNeispyRequest", http)
 
     async def request(
         self,
diff --git a/neispy/utils.py b/neispy/utils.py
index beb62fd..eb4bc6c 100644
--- a/neispy/utils.py
+++ b/neispy/utils.py
@@ -1,5 +1,5 @@
 from datetime import datetime, timedelta, timezone
-from typing import Any, Tuple
+from typing import Any, Tuple, get_type_hints
 
 from typing_extensions import Self
 
@@ -15,14 +15,13 @@ def now() -> str:
 class Deserializer:
     @classmethod
     def from_dict(cls, d: Any) -> Self:
-        annotations = cls.__annotations__
+        annotations = get_type_hints(cls)
         key = list(annotations.keys())[0]
         # 유형주석의 첫번째는 튜플형식 입니다.
         # 튜플의 첫번째는 Head이고 두번째는 Row입니다.
         # 그러므로 __args__[1]을 사용하여 Row를 가져옵니다.
         # Row의 제네릭 타입을 가져와서 객체를 생성해야하기 때문에 다시 __args__[0]을 사용합니다.
         row_type: AbstractRow = list(annotations.values())[0].__args__[1].__args__[0]
-
         obj: Tuple[Head, Row[Any]] = (
             Head.from_dict(d[key][0]),
             Row.from_dict([row_type.from_dict(d) for d in d[key][1]["row"]]),