diff --git a/extdbms/lib/Database/QueryBuilder.php b/extdbms/lib/Database/QueryBuilder.php
index ddf3a79..86a78db 100644
--- a/extdbms/lib/Database/QueryBuilder.php
+++ b/extdbms/lib/Database/QueryBuilder.php
@@ -75,35 +75,33 @@ class QueryBuilder
   }
 
   //Where절부분
-  final public function where(array|string $column, mixed $operator = null, mixed $value = null): static
+  final public function where(array|string $column, mixed $value = null, ?string $operator = null, string $boolean = "AND"): static
   {
     if (is_array($column)) {
       foreach ($column as $col => $val) {
-        $this->where($col, '=', $val);  // 재귀 호출
+        $this->where($col, $val);  // 재귀 호출
       }
       return $this;
     }
     // where("col = NOW()") 형태의 raw 처리
-    if ($operator === null && $value === null) {
-      $this->where[] = ['condition' => $column, 'boolean' => 'AND'];
+    if ($value === null && $operator === null) {
+      $this->where[] = ['condition' => $column, 'boolean' => $boolean];
       return $this;
     }
     // where("col", "val") → operator 생략 시 = 처리
-    if ($value === null) {
-      $value = $operator;
-      $operator = '=';
+    if ($operator === null) {
+      $operator = "=";
     }
     $placeholder = ':w_' . count($this->bindings);
-    $this->where[] = ['condition' => "$column $operator $placeholder", 'boolean' => 'AND'];
+    $this->where[] = ['condition' => "$column $operator $placeholder", 'boolean' => $boolean];
     $this->bindings[$placeholder] = $value;
     return $this;
   }
-  final public function orWhere(string $column, mixed $operator = null, mixed $value = null): static
+  final public function orWhere(array|string $column, mixed $value = null, ?string $operator = null, string $boolean = "OR"): static
   {
-    return $this->where($column, $operator, $value, "OR");
+    return $this->where($column, $value, $operator, $boolean);
   }
-
-  final public function whereIn(string $column, array $values, string $boolean = 'AND', $conditon_boolean = "IN"): static
+  final public function whereIn(string $column, array $values, string $boolean = 'AND', $conditon = "IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
@@ -114,23 +112,23 @@ class QueryBuilder
       $placeholders[] = $placeholder;
       $this->bindings[$placeholder] = $value;
     }
-    $condition = "$column $conditon_boolean (" . implode(', ', $placeholders) . ")";
+    $condition = "$column $conditon (" . implode(', ', $placeholders) . ")";
     $this->where[] = ['condition' => $condition, 'boolean' => $boolean];
     return $this;
   }
-  final public function whereNotIn(string $column, array $values, $boolean = "AND", $conditon_boolean = "NOT IN"): static
+  final public function whereNotIn(string $column, array $values, $boolean = "AND", $conditon = "NOT IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
     }
-    return $this->whereIn($column, $values, $boolean, $conditon_boolean);
+    return $this->whereIn($column, $values, $boolean, $conditon);
   }
-  final public function orWhereIn(string $column, array $values, $boolean = "OR", $conditon_boolean = "IN"): static
+  final public function orWhereIn(string $column, array $values, $boolean = "OR", $conditon = "IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
     }
-    return $this->whereIn($column, $values, $boolean, $conditon_boolean);
+    return $this->whereIn($column, $values, $boolean, $conditon);
   }
 
   //Join
@@ -140,6 +138,59 @@ class QueryBuilder
     return $this;
   }
 
+  //Like
+  //사용예:
+  // $model->like(['name' => '%홍%', 'email' => '%@naver.com%']);
+  // $model->likeIn(['title', 'description'], '%공지%');
+  // $model->orLikeIn(['name', 'nickname'], '%철수%');
+  public function like(array|string $column, ?string $value = null, string $operator = 'LIKE', string $boolean = "AND"): static
+  {
+    if (is_array($column)) {
+      $conditions = [];
+      foreach ($column as $col => $val) {
+        $placeholder = ':l_' . count($this->bindings);
+        $conditions[] = "$col $operator $placeholder";
+        $this->bindings[$placeholder] = $val;
+      }
+      $this->where[] = '(' . implode(" $boolean ", $conditions) . ')';
+    } else {
+      $placeholder = ':l_' . count($this->bindings);
+      $condition = "$column $operator $placeholder";
+      if (empty($this->where)) {
+        $this->where[] = $condition;
+      } else {
+        $last = array_pop($this->where);
+        $this->where[] = "($last $boolean $condition)";
+      }
+      $this->bindings[$placeholder] = $value;
+    }
+    return $this;
+  }
+  public function orLike(array|string $column, ?string $value = null, string $operator = 'LIKE', string $boolean = "OR"): static
+  {
+    return $this->like($column, $value, $operator, $boolean);
+  }
+
+  public function likeIn(array $columns, string $value, string $operator = "LIKE", string $boolean = "AND"): static
+  {
+    $orConditions = [];
+    foreach ($columns as $col) {
+      $placeholder = ':li_' . count($this->bindings);
+      $orConditions[] = "$col $operator $placeholder";
+      $this->bindings[$placeholder] = $value;
+    }
+    $this->where[] = '(' . implode(" $boolean ", $orConditions) . ')';
+    return $this;
+  }
+  public function orLikeIn(array $columns, string $value, string $operator = "LIKE", string $boolean = "OR"): static
+  {
+    return $this->likeIn($columns,  $value, $operator, $boolean);
+  }
+  public function notLikeIn(array $columns, string $value, string $operator = "NOT LIKE", string $boolean = "AND"): static
+  {
+    return $this->likeIn($columns,  $value, $operator, $boolean);
+  }
+
   //Order
   final public function orderBy(mixed $column, string $direction = 'ASC'): static
   {