diff --git a/kss/__init__.py b/kss/__init__.py
index 5c99482..ec31e64 100644
--- a/kss/__init__.py
+++ b/kss/__init__.py
@@ -6,4 +6,4 @@
 from kss._modules.summarization.summarize_sentences import summarize_sentences
 
 __ALL__ = [split_sentences, split_morphemes, summarize_sentences]
-__version__ = "4.5.1"
+__version__ = "4.5.2"
diff --git a/kss/_modules/sentences/sentence_processor.py b/kss/_modules/sentences/sentence_processor.py
index e2baf88..9d53916 100644
--- a/kss/_modules/sentences/sentence_processor.py
+++ b/kss/_modules/sentences/sentence_processor.py
@@ -6,7 +6,6 @@
 
 from kss._utils.const import (
     alphabet_with_quotes,
-    numbers_with_quotes,
     url_pattern,
     email_pattern,
     backup_normal,
@@ -19,12 +18,6 @@ class SentenceProcessor:
     _all_s_poses_wo_qtn = ("SP", "SF", "SY", "SE", "SSC", "QTC", "EMOJI", "JAMO")
 
     _heavy_backup = {}
-    _heavy_backup.update(
-        {
-            k: {_v: str(abs(hash(_v))) for _v in v}
-            for k, v in numbers_with_quotes.items()
-        }
-    )
     _heavy_backup.update(
         {
             k: {_v: str(abs(hash(_v))) for _v in v}
@@ -58,21 +51,23 @@ def _add_url_or_email(self, text):
         }
         self._normal_backup.update(_url_or_email)
 
-    def _backup_or_restore_heavy(self, target: str, check: str, restore: bool = False):
-        for source, purpose_dict in self._heavy_backup.items():
-            if source in check:
-                target = self._replace(target, purpose_dict, restore=restore)
-        return target
-
     @lru_cache(100)
     def backup(self, inputs: str):
         self._add_url_or_email(inputs)
         inputs = self._replace(inputs, self._normal_backup)
-        inputs = self._backup_or_restore_heavy(inputs, inputs)
+
+        for source, purpose_dict in self._heavy_backup.items():
+            if source in inputs:
+                inputs = self._replace(inputs, purpose_dict, restore=False)
+
         return inputs
 
     @lru_cache(100)
     def restore(self, outputs: str, inputs: str):
         outputs = self._replace(outputs, self._normal_backup, restore=True)
-        outputs = self._backup_or_restore_heavy(outputs, inputs, restore=True)
+
+        for source, purpose_dict in self._heavy_backup.items():
+            if source in inputs:
+                outputs = self._replace(outputs, purpose_dict, restore=True)
+
         return outputs
diff --git a/kss/_utils/const.py b/kss/_utils/const.py
index 044c720..058030e 100644
--- a/kss/_utils/const.py
+++ b/kss/_utils/const.py
@@ -279,16 +279,6 @@
 ]
 
 
-# inch: 3'2 inch
-# time: 06'30
-# year: '60s
-numbers_with_quotes = {}
-for num in numbers:
-    numbers_with_quotes[num] = set()
-    numbers_with_quotes[num].update({f"{num}{q}" for q in ["'", "’"]})
-    numbers_with_quotes[num].update({f"{q}{num}" for q in ["'", "’"]})
-
-
 # apostrophe: I`m, You’re, ...
 alphabet_with_quotes = {}
 for alpha in alphabets: