diff --git a/.github/workflows/01-building-blocks.yaml b/.github/workflows/01-building-blocks.yaml
index 8119c21..7ee7d1b 100644
--- a/.github/workflows/01-building-blocks.yaml
+++ b/.github/workflows/01-building-blocks.yaml
@@ -1,5 +1,5 @@
 name: 01 - Building Blocks
-on: push
+on: workflow_dispatch
 
 jobs:
   echo-hello:
diff --git a/.github/workflows/02-workflow-events.yaml b/.github/workflows/02-workflow-events.yaml
index 39196de..389b50e 100644
--- a/.github/workflows/02-workflow-events.yaml
+++ b/.github/workflows/02-workflow-events.yaml
@@ -1,12 +1,5 @@
 name: 02 - Workflow Events
 on:
-  push:
-  pull_request:
-  schedule:
-    - cron: "*/5 0 * * *"
-    # Cron expression
-    # 6개는 optional인데, github actions에서는 5까지만 가능
-    # 매분 은 매 5분부터 supporting됨
   workflow_dispatch:
     # enables manual trigger from clicking UI
 
diff --git a/.github/workflows/03-workflow-runers.yaml b/.github/workflows/03-workflow-runers.yaml
new file mode 100644
index 0000000..c7ba2aa
--- /dev/null
+++ b/.github/workflows/03-workflow-runers.yaml
@@ -0,0 +1,30 @@
+name: 03 - Workflow Runners
+
+on: workflow_dispatch
+jobs:
+  ubuntu-echo:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Show OS
+        run: |
+          echo "This job is running on an Ubuntu runner."
+          echo "Runner OS: $RUNNER_OS"
+        # Linux environment variable syntax
+  windows-echo:
+    runs-on: windos-latest
+    steps:
+      - name: Show OS
+        shell: bash
+        # windows powershell에서 environment variable syntax가
+        # $VARIABLE이 아니기 때문에 shell을 bash로 바꿔주는 것
+        # → 각 OS의 shell에 맞는 script문법을 써야합니다
+        run: |
+          echo "This job is running on an Windows runner."
+          echo "Runner OS: $RUNNER_OS"
+  mac-echo:
+    runs-on: macos-latest
+    steps:
+      - name: Show OS
+        run: |
+          echo "This job is running on an MacOs runner."
+          echo "Runner OS: $RUNNER_OS"
diff --git a/README.md b/README.md
index a9ad0b3..dc45ecb 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # GITHUB ACTIONS
 
 This have been edited on 'test_workflow_trigger' branch
+
+This have been edited again on 'test_workflow_trigger' branch on behalf of 05-1-filters-activity-types's pull request activity.