diff --git a/hwe/func.php b/hwe/func.php
index a4d2fbfd..c674297a 100644
--- a/hwe/func.php
+++ b/hwe/func.php
@@ -2579,7 +2579,7 @@ function searchDistance(int $from, int $maxDist=99, bool $distForm = false) {
     }
 }
 
-function isClose(int $nation1, int $nation2, bool $includeNoSupply=true) {
+function isNeighbor(int $nation1, int $nation2, bool $includeNoSupply=true) {
     $db = DB::db();
 
     $nation1Cities = [];
diff --git a/hwe/func_npc.php b/hwe/func_npc.php
index 1ca72088..1dedf5fd 100644
--- a/hwe/func_npc.php
+++ b/hwe/func_npc.php
@@ -479,7 +479,7 @@ function processAI($no) {
                         for($i=0; $i < $nationCount; $i++) {
                             $youNation = MYDB_fetch_array($result);
 
-                            if(isClose($general['nation'], $youNation['nation'])) {
+                            if(isNeighbor($general['nation'], $youNation['nation'])) {
                                 $command = EncodeCommand(0, 0, $youNation['nation'], 62);
                                 $query = "update nation set l12turn0='$command' where nation='{$general['nation']}'";
                                 MYDB_query($query, $connect) or Error("processAI09 ".MYDB_error($connect),"");
diff --git a/hwe/func_process_chief.php b/hwe/func_process_chief.php
index 7eb84dda..b26315a5 100644
--- a/hwe/func_process_chief.php
+++ b/hwe/func_process_chief.php
@@ -744,7 +744,7 @@ function process_62(&$general) {
         $log[] = "<C>●</>{$admin['month']}월:아국과 불가침중입니다. 선포 실패. <1>$date</>";
     } elseif($dipcount != 0) {
         $log[] = "<C>●</>{$admin['month']}월:상대국이 외교 진행중입니다. 선포 실패. <1>$date</>";
-    } elseif(!isClose($nation['nation'], $younation['nation'])) {
+    } elseif(!isNeighbor($nation['nation'], $younation['nation'])) {
         $log[] = "<C>●</>{$admin['month']}월:인접하지 않았습니다. 선포 실패. <1>$date</>";
     } elseif($admin['year'] <= $admin['startyear']) {
         $log[] = "<C>●</>{$admin['month']}월:초반제한 해제 2년전부터 가능합니다. 선포 실패. <1>$date</>";
diff --git a/hwe/processing.php b/hwe/processing.php
index d80b2215..0fde94b7 100644
--- a/hwe/processing.php
+++ b/hwe/processing.php
@@ -1785,7 +1785,7 @@ function command_51($turn, $command) {
     for($i=1; $i <= $count; $i++) {
         $nation = MYDB_fetch_array($result);
 
-        if($myNation['power'] <= $nation['power'] * 3 || !isClose($me['nation'], $nation['nation'])) {
+        if($myNation['power'] <= $nation['power'] * 3 || !isNeighbor($me['nation'], $nation['nation'])) {
             echo "<option style=color:{$nation['color']};background-color:red; value={$nation['nation']}>【 {$nation['name']} 】</option>";
         } else {
             echo "<option style=color:{$nation['color']} value={$nation['nation']}>【 {$nation['name']} 】</option>";
@@ -1929,7 +1929,7 @@ function command_53($turn, $command) {
     for($i=1; $i <= $count; $i++) {
         $nation = MYDB_fetch_array($result);
 
-        if($myNation['power']+$nation['power'] > $cond1 || $myNation['gennum']+$nation['gennum'] > $cond2 || !isClose($me['nation'], $nation['nation'])) {
+        if($myNation['power']+$nation['power'] > $cond1 || $myNation['gennum']+$nation['gennum'] > $cond2 || !isNeighbor($me['nation'], $nation['nation'])) {
             echo "<option style=color:{$nation['color']};background-color:red; value={$nation['nation']}>【 {$nation['name']} 】</option>";
         } else {
             echo "<option style=color:{$nation['color']} value={$nation['nation']}>【 {$nation['name']} 】</option>";
diff --git a/hwe/sammo/Engine/Diplomacy.php b/hwe/sammo/Engine/Diplomacy.php
index 22646381..ebe5508f 100644
--- a/hwe/sammo/Engine/Diplomacy.php
+++ b/hwe/sammo/Engine/Diplomacy.php
@@ -148,7 +148,7 @@ class Diplomacy{
             return $prev;
         }
 
-        if(!\sammo\isClose($this->srcNation['nation'], $this->destNation['nation'], false)){
+        if(!\sammo\isNeighbor($this->srcNation['nation'], $this->destNation['nation'], false)){
             return [DiplomaticMessage::DECLINED, '상대국의 도시들과 보급선이 이어지지 않았습니다.'];
         }
 
@@ -160,7 +160,7 @@ class Diplomacy{
             return $prev;
         }
 
-        if(!\sammo\isClose($this->srcNation['nation'], $this->destNation['nation'], true)){
+        if(!\sammo\isNeighbor($this->srcNation['nation'], $this->destNation['nation'], true)){
             return [DiplomaticMessage::DECLINED, '상대국의 도시와 인접하지 않았습니다.'];
         }