diff --git a/hwe/sammo/Event/Action/LostUniqueItem.php b/hwe/sammo/Event/Action/LostUniqueItem.php
new file mode 100644
index 00000000..0463d40a
--- /dev/null
+++ b/hwe/sammo/Event/Action/LostUniqueItem.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace sammo\Event\Action;
+
+use sammo\ActionLogger;
+use sammo\CityConst;
+use sammo\DB;
+use sammo\KVStorage;
+use sammo\Util;
+use sammo\General;
+use sammo\JosaUtil;
+use sammo\LiteHashDRBG;
+use sammo\RandUtil;
+use sammo\UniqueConst;
+
+class LostUniqueItem extends \sammo\Event\Action
+{
+  public function __construct(
+    private float $lostProb = 0.1,
+  ) {
+  }
+
+  public function run(array $env)
+  {
+    $db = DB::db();
+
+    $generalIDList = $db->queryFirstColumn("SELECT `no` FROM general WHERE npc <= 1");
+    if(!$generalIDList){
+      return;
+    }
+    $generals = General::createGeneralObjListFromDB($generalIDList);
+
+    $lostItems = [];
+    $lostCnt = 0;
+
+    $year = $env['year'];
+    $month = $env['month'];
+    $rng = new RandUtil(new LiteHashDRBG(Util::simpleSerialize(
+      UniqueConst::$hiddenSeed,
+      'LostUniqueItem',
+      $year,
+      $month,
+    )));
+
+    foreach ($generals as $general) {
+      $itemList = $general->getItems();
+      $didLoseItem = false;
+      foreach ($itemList as $itemType => $item) {
+        if ($item->isBuyable()) {
+          continue;
+        }
+
+
+        $logger = $general->getLogger();
+
+        if ($rng->nextBool($this->lostProb)) {
+          $itemName = $item->getName();
+          $itemRawName = $item->getRawName();
+          $josaUl = JosaUtil::pick($itemRawName, '을');
+          $lostItems[$itemName] = 1;
+          $lostCnt++;
+          $general->setItem($itemType, 'None');
+          $didLoseItem = true;
+          $logger->pushGeneralActionLog("<C>{$itemName}</>{$josaUl} 잃었습니다.");
+        }
+      }
+
+      if ($didLoseItem) {
+        $general->applyDB($db);
+      }
+    }
+
+    $logger = new ActionLogger(0, 0, $year, $month);
+    if($lostCnt == 0){
+      $logger->pushGlobalHistoryLog("<R><b>【망실】</b></>어떤 아이템도 잃지 않았습니다!");
+    }
+    else{
+      $logger->pushGlobalHistoryLog("<R><b>【망실】</b></>총 <C>{$lostCnt}</>개의 아이템을 잃었습니다!");
+    }
+    $logger->flush();
+
+  }
+}