diff --git a/cert-manager/argocd.yaml b/cert-manager/argocd.yaml
deleted file mode 100644
index 7b01bdd..0000000
--- a/cert-manager/argocd.yaml
+++ /dev/null
@@ -1,44 +0,0 @@
-apiVersion: argoproj.io/v1alpha1
-kind: Application
-metadata:
-  name: cert-manager
-  namespace: argocd
-  finalizers:
-  - resources-finalizer.argocd.argoproj.io
-spec:
-  project: default
-  sources:
-  - repoURL: https://charts.jetstack.io
-    chart: cert-manager
-    targetRevision: v1.16.2
-    helm:
-      valueFiles:
-      - $values/cert-manager/helm-values.yaml
-  - repoURL: https://github.com/K3S-HOME/platform.git
-    targetRevision: main
-    ref: values
-  - repoURL: https://github.com/K3S-HOME/platform.git
-    targetRevision: main
-    path: cert-manager
-  destination:
-    server: https://kubernetes.default.svc
-    namespace: cert-manager
-  syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
-      allowEmpty: false
-    syncOptions:
-    - CreateNamespace=true
-    - PrunePropagationPolicy=foreground
-    - PruneLast=true
-    retry:
-      limit: 5
-      backoff:
-        duration: 5s
-        factor: 2
-        maxDuration: 3m
-    managedNamespaceMetadata:
-      labels:
-        goldilocks.fairwinds.com/enabled: 'true'
-  revisionHistoryLimit: 10
diff --git a/cert-manager/helm-values.yaml b/cert-manager/helm-values.yaml
deleted file mode 100644
index cf98a70..0000000
--- a/cert-manager/helm-values.yaml
+++ /dev/null
@@ -1,70 +0,0 @@
-# Cert-Manager Helm Values
-# Chart: https://github.com/cert-manager/cert-manager/tree/master/deploy/charts/cert-manager
-
-# Install CRDs with Helm
-installCRDs: true
-
-replicaCount: 1
-
-resources:
-  requests:
-    cpu: 23m
-    memory: 115Mi
-  limits:
-    memory: 115Mi
-
-webhook:
-  replicaCount: 1
-  resources:
-    requests:
-      cpu: 23m
-      memory: 115Mi
-    limits:
-      memory: 115Mi
-  # Affinity - Soft Anti-Affinity to spread pods across nodes
-  affinity:
-    podAntiAffinity:
-      preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 100
-          podAffinityTerm:
-            labelSelector:
-              matchLabels:
-                app.kubernetes.io/name: cert-manager-webhook
-            topologyKey: kubernetes.io/hostname
-
-cainjector:
-  replicaCount: 1
-  resources:
-    requests:
-      cpu: 23m
-      memory: 230Mi
-    limits:
-      memory: 230Mi
-  # Affinity - Soft Anti-Affinity to spread pods across nodes
-  affinity:
-    podAntiAffinity:
-      preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 100
-          podAffinityTerm:
-            labelSelector:
-              matchLabels:
-                app.kubernetes.io/name: cert-manager-cainjector
-            topologyKey: kubernetes.io/hostname
-
-# Affinity - Soft Anti-Affinity to spread pods across nodes
-affinity:
-  podAntiAffinity:
-    preferredDuringSchedulingIgnoredDuringExecution:
-      - weight: 100
-        podAffinityTerm:
-          labelSelector:
-            matchLabels:
-              app.kubernetes.io/name: cert-manager
-          topologyKey: kubernetes.io/hostname
-
-# Prometheus metrics
-prometheus:
-  enabled: true
-  servicemonitor:
-    enabled: false
-
diff --git a/cert-manager/kustomization.yaml b/cert-manager/kustomization.yaml
deleted file mode 100644
index f9347af..0000000
--- a/cert-manager/kustomization.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-resources:
-- manifests/cluster-issuer.yaml
diff --git a/cert-manager/manifests/cluster-issuer.yaml b/cert-manager/manifests/cluster-issuer.yaml
deleted file mode 100644
index c2ab14c..0000000
--- a/cert-manager/manifests/cluster-issuer.yaml
+++ /dev/null
@@ -1,41 +0,0 @@
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-prod
-spec:
-  acme:
-    # Let's Encrypt Production 서버
-    # 실제 운영 환경에서 사용
-    # Rate limit: 50 certificates per registered domain per week
-    server: https://acme-v02.api.letsencrypt.org/directory
-
-    # 인증서 만료 알림을 받을 이메일 주소
-    email: bluemayne0213@icloud.com
-
-    # ACME 계정의 private key를 저장할 Secret 이름
-    privateKeySecretRef:
-      name: letsencrypt-prod
-
-    # HTTP-01 challenge를 사용하여 도메인 소유권 검증
-    # Traefik Ingress를 통해 /.well-known/acme-challenge/ 경로로 검증
-    solvers:
-    - http01:
-        ingress:
-          class: traefik
----
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-staging
-spec:
-  acme:
-    # Let's Encrypt Staging 서버
-    # 테스트용 - 브라우저에서 신뢰하지 않지만 rate limit 없음
-    server: https://acme-staging-v02.api.letsencrypt.org/directory
-    email: bluemayne0213@icloud.com
-    privateKeySecretRef:
-      name: letsencrypt-staging
-    solvers:
-    - http01:
-        ingress:
-          class: traefik
diff --git a/kustomization.yaml b/kustomization.yaml
index df53d9b..6fd5f4e 100644
--- a/kustomization.yaml
+++ b/kustomization.yaml
@@ -6,7 +6,6 @@ resources:
   - application.yaml
 
   # Core infrastructure
-  - cert-manager/argocd.yaml
   - traefik/argocd.yaml
   - argocd/argocd.yaml
   - argocd/image-updater.yaml