diff --git a/Include/Fledasty/Strings/UTF8String.h b/Include/Fledasty/Strings/UTF8String.h
index 310781c..6a35530 100644
--- a/Include/Fledasty/Strings/UTF8String.h
+++ b/Include/Fledasty/Strings/UTF8String.h
@@ -39,6 +39,7 @@ FledastyError fledasty_utf8_string_destroy(FledastyUtf8String *current_string);
 
 FledastyError fledasty_utf8_string_append(FledastyUtf8String *current_string, unsigned char *character_string, size_t character_string_length);
 FledastyError fledasty_utf8_string_insert_before_string(FledastyUtf8String *current_string, unsigned char *before_character_string, size_t before_character_string_length, unsigned char *character_string, size_t character_string_length);
+FledastyError fledasty_utf8_string_insert_after_string(FledastyUtf8String *current_string, unsigned char *after_character_string, size_t after_character_string_length, unsigned char *character_string, size_t character_string_length);
 
 FledastyUtf8String fledasty_utf8_string_encode(uint32_t *unicode, const size_t size);
 uint32_t *fledasty_utf8_string_decode(FledastyUtf8String *current_string, size_t *unicode_string_length);
diff --git a/Src/Strings/UTF8String.c b/Src/Strings/UTF8String.c
index 4d838ec..88107c3 100644
--- a/Src/Strings/UTF8String.c
+++ b/Src/Strings/UTF8String.c
@@ -125,6 +125,37 @@ FledastyError fledasty_utf8_string_insert_before_string(FledastyUtf8String *curr
     return FLEDASTY_ERROR_NONE;
 }
 
+FledastyError fledasty_utf8_string_insert_after_string(FledastyUtf8String *current_string, unsigned char *after_character_string, size_t after_character_string_length, unsigned char *character_string, size_t character_string_length) {
+    if (current_string == NULL || after_character_string == NULL || after_character_string_length == 0 || character_string == NULL || character_string_length == 0) {
+        return FLEDASTY_ERROR_INVALID_POINTER;
+    }
+
+    if (!fledasty_utf8_string_validate(after_character_string, after_character_string_length) || !fledasty_utf8_string_validate(character_string, character_string_length)) {
+        return FLEDASTY_ERROR_INVALID_VALUE;
+    }
+
+    size_t index = 0;
+    while (index < (current_string->size - after_character_string_length) && !hallocy_compare_memory(current_string->character_string + index, after_character_string, after_character_string_length)) {
+        index += 1;
+    }
+
+    if (index == current_string->size - after_character_string_length) {
+        return FLEDASTY_ERROR_VALUE_NOT_FOUND;
+    }
+
+    if (current_string->capacity <= current_string->size + character_string_length) {
+        current_string->capacity += (current_string->capacity > character_string_length) ? current_string->capacity : character_string_length;
+        current_string->character_string = (unsigned char*)hallocy_realloc(current_string->character_string, current_string->capacity * sizeof(unsigned char));
+    }
+
+    index += after_character_string_length;
+    hallocy_move_memory(current_string->character_string + (index + character_string_length), current_string->character_string + index, current_string->size - index);
+    hallocy_copy_memory(current_string->character_string + index, character_string, character_string_length);
+    
+    current_string->size += character_string_length;
+    return FLEDASTY_ERROR_NONE;
+}
+
 FledastyUtf8String fledasty_utf8_string_encode(uint32_t *unicode, const size_t size) {
     FledastyUtf8String utf8_string;
     fledasty_utf8_string_initialize(&utf8_string, NULL, 0);
diff --git a/Tests/Main.c b/Tests/Main.c
index 479057f..29bdc2d 100644
--- a/Tests/Main.c
+++ b/Tests/Main.c
@@ -19,7 +19,6 @@
  * Author: Mineplay
  * -----------------------------------------------------------------------------
  */
-#include "Fledasty/Utils/Error.h"
 #include <stdio.h>
 #include <Hallocy/Core/Allocator.h>
 #include <Fledasty/Core/Queue.h>
@@ -234,6 +233,8 @@ int main() {
     printf("Append: %s\n", test_utf8_string.character_string);
     fledasty_utf8_string_insert_before_string(&test_utf8_string, (unsigned char*)"😀", 4, (unsigned char*)"Hello", 5);
     printf("Insert Before: %s\n", test_utf8_string.character_string);
+    fledasty_utf8_string_insert_after_string(&test_utf8_string, (unsigned char*)"😀", 4, (unsigned char*)"Bye", 3);
+    printf("Insert After: %s\n", test_utf8_string.character_string);
 
     size_t unicode_length = 0;
     uint32_t *unicode = fledasty_utf8_string_decode(&test_utf8_string, &unicode_length);