diff --git a/src/js/select2/dropdown/search.js b/src/js/select2/dropdown/search.js
index 338030169d..86378e1898 100644
--- a/src/js/select2/dropdown/search.js
+++ b/src/js/select2/dropdown/search.js
@@ -48,9 +48,20 @@ define([
     });
 
     this.$search.on('keyup input', function (evt) {
-      self.handleSearch(evt);
+      // Set the current input value to an empty string if the previous value is undefined.
+      self.preTargetValue = self.preTargetValue === undefined ? "" : self.preTargetValue;
+
+      // In the case of Korean characters, the 'input' event can occur even when
+      // arrow keys or enter keys are pressed. Therefore, prevent additional actions
+      // and avoid duplicate searches if the value has not changed.
+      if (self.preTargetValue === evt.target.value) {
+        evt.preventDefault();
+      } else {
+        self.preTargetValue = evt.target.value;
+        self.handleSearch(evt);
+      }
     });
-
+    
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
       self.$search.attr('aria-controls', resultsId);