diff --git a/src/main/java/woowa/team4/bff/review/ReviewThis.java b/src/main/java/woowa/team4/bff/review/ReviewThis.java
new file mode 100644
index 00000000..259274ae
--- /dev/null
+++ b/src/main/java/woowa/team4/bff/review/ReviewThis.java
@@ -0,0 +1,20 @@
+package woowa.team4.bff.review;
+
+public class ReviewThis {
+
+    private static int value = 0;
+    private static boolean flag = false;
+
+    public static void main(String[] args) {
+        new Thread(() -> {
+            while (!flag) {
+            }
+            System.out.println("value: " + value);
+        }).start();
+
+        new Thread(() -> {
+            value = 42;
+            flag = true;
+        }).start();
+    }
+}