diff --git a/.github/workflows/assign-reviewer.yml b/.github/workflows/assign-reviewer.yml
index 69a5846..2bf910e 100644
--- a/.github/workflows/assign-reviewer.yml
+++ b/.github/workflows/assign-reviewer.yml
@@ -14,55 +14,78 @@ jobs:
     steps:
       - name: Check out repository
         uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.PAT }} # PAT를 사용하도록 설정
+          persist-credentials: false
 
-      - name: Fetch organization members
-        id: fetch-members
+      - name: Fetch repository collaborators
+        id: fetch-collaborators
         run: |
-          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
-            "https://api.github.com/orgs/Wannabe-Woowa-Article/members")
-          ORG_MEMBERS=$(echo "$RESPONSE" | jq -r '.[].login' | tr '\n' ' ')
-          echo "ORG_MEMBERS=$ORG_MEMBERS" >> $GITHUB_ENV
+          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.PAT }}" \
+            "https://api.github.com/repos/${{ github.repository }}/collaborators")
+          COLLABORATORS=$(echo "$RESPONSE" | jq -r '.[].login' | tr '\n' ' ')
+          echo "COLLABORATORS=$COLLABORATORS" >> $GITHUB_ENV
 
-      - name: Fetch existing PR assignees
-        id: fetch-pr-assignees
+      - name: Fetch existing PR reviewers
+        id: fetch-pr-reviewers
         run: |
-          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.PAT }}" \
+            "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers")
+          EXISTING_REVIEWERS=$(echo "$RESPONSE" | jq -r '.users[].login' | sort | uniq | tr '\n' ' ')
+          echo "EXISTING_REVIEWERS=$EXISTING_REVIEWERS" >> $GITHUB_ENV
+
+      - name: Fetch all assigned reviewers
+        id: fetch-all-reviewers
+        run: |
+          RESPONSE=$(curl -s -H "Authorization: token ${{ secrets.PAT }}" \
             "https://api.github.com/repos/${{ github.repository }}/pulls")
-          EXISTING_ASSIGNEES=$(echo "$RESPONSE" | jq -r '.[].assignees[].login' | sort | uniq | tr '\n' ' ')
-          echo "EXISTING_ASSIGNEES=$EXISTING_ASSIGNEES" >> $GITHUB_ENV
+          ALL_REVIEWERS=$(echo "$RESPONSE" | jq -r '.[].requested_reviewers | .[].login' | sort | uniq | tr '\n' ' ')
+          echo "ALL_REVIEWERS=$ALL_REVIEWERS" >> $GITHUB_ENV
 
-      - name: Select random member
+      - name: Select random collaborator
         id: select-random
         run: |
-          # Convert organization members to array
-          ORG_MEMBERS_ARRAY=($ORG_MEMBERS)
+          # Convert collaborators to array
+          COLLABORATORS_ARRAY=($COLLABORATORS)
 
-          # Convert existing assignees to array
-          EXISTING_ASSIGNEES_ARRAY=($EXISTING_ASSIGNEES)
+          # Convert existing reviewers to array
+          EXISTING_REVIEWERS_ARRAY=($EXISTING_REVIEWERS)
 
-          # Remove PR author from organization members
+          # Convert all reviewers to array
+          ALL_REVIEWERS_ARRAY=($ALL_REVIEWERS)
+
+          # Remove PR author and already assigned reviewers from collaborators
           PR_AUTHOR=${{ github.event.pull_request.user.login }}
-          FILTERED_MEMBERS=()
-          for member in "${ORG_MEMBERS_ARRAY[@]}"; do
-            if [[ "$member" != "$PR_AUTHOR" && ! " ${EXISTING_ASSIGNEES_ARRAY[@]} " =~ " ${member} " ]]; then
-              FILTERED_MEMBERS+=($member)
+          FILTERED_COLLABORATORS=()
+          for collaborator in "${COLLABORATORS_ARRAY[@]}"; do
+            if [[ "$collaborator" != "$PR_AUTHOR" && ! " ${EXISTING_REVIEWERS_ARRAY[@]} " =~ " ${collaborator} " && ! " ${ALL_REVIEWERS_ARRAY[@]} " =~ " ${collaborator} " ]]; then
+              FILTERED_COLLABORATORS+=($collaborator)
             fi
           done
 
-          # Check if there are any eligible members left
-          if [ ${#FILTERED_MEMBERS[@]} -eq 0 ]; then
-            echo "No eligible members to assign"
+          # Check if there are any eligible collaborators left
+          if [ ${#FILTERED_COLLABORATORS[@]} -eq 0 ]; then
+            echo "No eligible collaborators to assign"
             exit 1
           fi
 
-          # Select a random member from filtered members
-          RANDOM_MEMBER=${FILTERED_MEMBERS[$RANDOM % ${#FILTERED_MEMBERS[@]}]}
-          echo "SELECTED_MEMBER=$RANDOM_MEMBER" >> $GITHUB_ENV
+          # Select a random collaborator from filtered collaborators
+          RANDOM_COLLABORATOR=${FILTERED_COLLABORATORS[$RANDOM % ${#FILTERED_COLLABORATORS[@]}]}
+          echo "SELECTED_COLLABORATOR=$RANDOM_COLLABORATOR" >> $GITHUB_ENV
+
+      - name: Assign PR to selected reviewer
+        run: |
+          curl -X POST \
+            -H "Accept: application/vnd.github.v3+json" \
+            -H "Authorization: token ${{ secrets.PAT }}" \
+            -d '{"reviewers":["${{ env.SELECTED_COLLABORATOR }}"]}' \
+            "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers"
 
-      - name: Assign PR to selected member
+      - name: Assign PR to the author
         run: |
+          PR_AUTHOR=${{ github.event.pull_request.user.login }}
           curl -X POST \
             -H "Accept: application/vnd.github.v3+json" \
-            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
-            -d '{"assignees":["${{ env.SELECTED_MEMBER }}"]}' \
+            -H "Authorization: token ${{ secrets.PAT }}" \
+            -d '{"assignees":["'$PR_AUTHOR'"]}' \
             "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/assignees"
diff --git a/actions-test.md b/actions-test.md
new file mode 100644
index 0000000..7ff5738
--- /dev/null
+++ b/actions-test.md
@@ -0,0 +1 @@
+action test!