diff --git a/internal/httpapi/handlers_projects.go b/internal/httpapi/handlers_projects.go
index 1d46a0e..5e860fe 100644
--- a/internal/httpapi/handlers_projects.go
+++ b/internal/httpapi/handlers_projects.go
@@ -335,8 +335,11 @@ func (s *Server) handleListContacts(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, out)
 }
 
+// 업체 담당자는 협업 정보라 프로젝트 구성원이면 누구나 CRUD 가능(관리자 전용 아님).
 func (s *Server) handleUpsertContact(w http.ResponseWriter, r *http.Request) {
-	if !s.requireAdmin(w, r) {
+	id := chi.URLParam(r, "id")
+	if !s.canSeeProject(r, id) {
+		writeError(w, http.StatusForbidden, "권한이 없습니다")
 		return
 	}
 	var c models.ClientContact
@@ -344,7 +347,7 @@ func (s *Server) handleUpsertContact(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, err.Error())
 		return
 	}
-	c.ProjectID = chi.URLParam(r, "id")
+	c.ProjectID = id
 	if c.ID != "" {
 		s.db.Save(&c)
 	} else {
@@ -354,13 +357,59 @@ func (s *Server) handleUpsertContact(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) handleDeleteContact(w http.ResponseWriter, r *http.Request) {
-	if !s.requireAdmin(w, r) {
+	var c models.ClientContact
+	if err := s.db.First(&c, "id = ?", chi.URLParam(r, "cId")).Error; err != nil {
+		writeError(w, http.StatusNotFound, "담당자를 찾을 수 없습니다")
 		return
 	}
-	s.db.Delete(&models.ClientContact{}, "id = ?", chi.URLParam(r, "cId"))
+	if !s.canSeeProject(r, c.ProjectID) {
+		writeError(w, http.StatusForbidden, "권한이 없습니다")
+		return
+	}
+	s.db.Delete(&models.ClientContact{}, "id = ?", c.ID)
 	writeJSON(w, http.StatusOK, map[string]bool{"ok": true})
 }
 
+// handlePatchProjectNotes lets any project member edit NON-sensitive descriptive
+// fields (주의사항·계약범위 글/그림). 핵심정보(상태·PM·일정·업체)와 계약/정산은
+// 여전히 관리자 전용(handlePatchProject).
+func (s *Server) handlePatchProjectNotes(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	if !s.canSeeProject(r, id) {
+		writeError(w, http.StatusForbidden, "권한이 없습니다")
+		return
+	}
+	var in struct {
+		Cautions     *string `json:"cautions"`
+		ScopeText    *string `json:"scopeText"`
+		ScopeGraphic *string `json:"scopeGraphic"`
+	}
+	if err := decodeJSON(r, &in); err != nil {
+		writeError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	upd := map[string]interface{}{}
+	if in.Cautions != nil {
+		upd["cautions"] = *in.Cautions
+	}
+	if in.ScopeText != nil {
+		upd["scope_text"] = *in.ScopeText
+	}
+	if in.ScopeGraphic != nil {
+		upd["scope_graphic"] = *in.ScopeGraphic
+	}
+	var p models.Project
+	if err := s.db.First(&p, "id = ?", id).Error; err != nil {
+		writeError(w, http.StatusNotFound, "프로젝트를 찾을 수 없습니다")
+		return
+	}
+	if len(upd) > 0 {
+		s.db.Model(&p).Updates(upd)
+		s.db.First(&p, "id = ?", id)
+	}
+	writeJSON(w, http.StatusOK, p)
+}
+
 // ---- tasks (gantt / kanban) ----------------------------------------------
 
 func (s *Server) handleListTasks(w http.ResponseWriter, r *http.Request) {
diff --git a/internal/httpapi/router.go b/internal/httpapi/router.go
index d23e7b6..6ac4ce2 100644
--- a/internal/httpapi/router.go
+++ b/internal/httpapi/router.go
@@ -122,6 +122,7 @@ func NewRouter(db *gorm.DB, store *storage.Storage, cfg config.Config, pusher *p
 			r.Get("/projects/{id}/contacts", s.handleListContacts)
 			r.Post("/projects/{id}/contacts", s.handleUpsertContact)
 			r.Delete("/contacts/{cId}", s.handleDeleteContact)
+			r.Patch("/projects/{id}/notes", s.handlePatchProjectNotes)
 			r.Get("/projects/{id}/tasks", s.handleListTasks)
 			r.Post("/projects/{id}/tasks", s.handleCreateTask)
 			r.Patch("/tasks/{tId}", s.handlePatchTask)