diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/ClientLogs.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/ClientLogs.razor
index f33b0ae..03697d9 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/ClientLogs.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/ClientLogs.razor
@@ -14,6 +14,15 @@
     </header>
 
     <div class="admin-simple-card">
+        @if (_summary is not null)
+        {
+            <div class="admin-log-summary">
+                <div><strong>Total</strong> @_summary.Total</div>
+                <div><strong>Error</strong> @_summary.ErrorCount</div>
+                <div><strong>Warning</strong> @_summary.WarningCount</div>
+                <div><strong>Info</strong> @_summary.InfoCount</div>
+            </div>
+        }
         <div class="admin-log-filter-row">
             <input class="mud-input-slot" placeholder="검색어" @bind="_query" @bind:event="oninput" />
             <select class="mud-input-slot" @bind="_level">
@@ -57,6 +66,7 @@
     private bool _loading = true;
     private string _query = "";
     private string _level = "";
+    private ClientLogSummaryDto? _summary;
 
     protected override async Task OnInitializedAsync()
     {
@@ -70,6 +80,7 @@
 
         try
         {
+            _summary = await Http.GetFromJsonAsync<ClientLogSummaryDto>("/taxbaik/api/client-logs/summary");
             var url = $"/taxbaik/api/client-logs/recent?q={Uri.EscapeDataString(_query ?? string.Empty)}&level={Uri.EscapeDataString(_level ?? string.Empty)}";
             var result = await Http.GetFromJsonAsync<List<ClientLogDto>>(url);
             if (result is not null)
@@ -95,4 +106,12 @@
         public string? Message { get; set; }
         public string? Route { get; set; }
     }
+
+    private sealed class ClientLogSummaryDto
+    {
+        public int Total { get; set; }
+        public int ErrorCount { get; set; }
+        public int WarningCount { get; set; }
+        public int InfoCount { get; set; }
+    }
 }
diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/DashboardOverview.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/DashboardOverview.razor
index c2d2985..1627cc1 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/DashboardOverview.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/DashboardOverview.razor
@@ -23,5 +23,10 @@
             <div>하위 경로 배포와 렌더러 분리를 유지하도록 라우트 린트를 적용합니다.</div>
             <a href="/taxbaik/admin/client-logs">최근 에러 확인</a>
         </article>
+        <article class="admin-simple-card">
+            <strong>원인 규명</strong>
+            <div>중복되는 오류는 최근 로그 요약에서 source와 route 기준으로 묶어 봅니다.</div>
+            <a href="/taxbaik/admin/client-logs?q=invoke">오류 검색</a>
+        </article>
     </div>
 </section>
diff --git a/src/TaxBaik.Web/Endpoints/ClientLogs/GetSummaryEndpoint.cs b/src/TaxBaik.Web/Endpoints/ClientLogs/GetSummaryEndpoint.cs
new file mode 100644
index 0000000..2d53f82
--- /dev/null
+++ b/src/TaxBaik.Web/Endpoints/ClientLogs/GetSummaryEndpoint.cs
@@ -0,0 +1,107 @@
+using FastEndpoints;
+
+namespace TaxBaik.Web.Endpoints.ClientLogs;
+
+public sealed class ClientLogSummary
+{
+    public int Total { get; set; }
+    public int ErrorCount { get; set; }
+    public int WarningCount { get; set; }
+    public int InfoCount { get; set; }
+    public IReadOnlyList<KeyValuePair<string, int>> TopSources { get; set; } = [];
+    public IReadOnlyList<KeyValuePair<string, int>> TopRoutes { get; set; } = [];
+}
+
+public sealed class GetSummaryEndpoint : EndpointWithoutRequest<ClientLogSummary>
+{
+    private readonly IWebHostEnvironment _environment;
+
+    public GetSummaryEndpoint(IWebHostEnvironment environment)
+    {
+        _environment = environment;
+    }
+
+    public override void Configure()
+    {
+        Get("/api/client-logs/summary");
+        Policies("AdminOnly");
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        var logDir = Path.Combine(_environment.ContentRootPath, "logs");
+        var summary = new ClientLogSummary();
+        if (!Directory.Exists(logDir))
+        {
+            await SendAsync(summary, cancellation: ct);
+            return;
+        }
+
+        var files = Directory.GetFiles(logDir, "taxbaik-*.log")
+            .OrderByDescending(File.GetLastWriteTimeUtc)
+            .Take(3)
+            .ToArray();
+
+        var sourceCounts = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
+        var routeCounts = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
+
+        foreach (var file in files)
+        {
+            foreach (var line in await File.ReadAllLinesAsync(file, ct))
+            {
+                if (!line.Contains("ClientLog ", StringComparison.OrdinalIgnoreCase))
+                    continue;
+
+                summary.Total++;
+                var level = ExtractLevel(line);
+                if (string.Equals(level, "error", StringComparison.OrdinalIgnoreCase))
+                    summary.ErrorCount++;
+                else if (string.Equals(level, "warning", StringComparison.OrdinalIgnoreCase))
+                    summary.WarningCount++;
+                else
+                    summary.InfoCount++;
+
+                var source = ExtractSegment(line, "ClientLog ", 2) ?? "unknown";
+                var route = ExtractNamedValue(line, "Route=") ?? "unknown";
+                sourceCounts[source] = sourceCounts.TryGetValue(source, out var sourceCount) ? sourceCount + 1 : 1;
+                routeCounts[route] = routeCounts.TryGetValue(route, out var routeCount) ? routeCount + 1 : 1;
+            }
+        }
+
+        summary.TopSources = sourceCounts
+            .OrderByDescending(kvp => kvp.Value)
+            .Take(5)
+            .ToList();
+        summary.TopRoutes = routeCounts
+            .OrderByDescending(kvp => kvp.Value)
+            .Take(5)
+            .ToList();
+
+        await SendAsync(summary, cancellation: ct);
+    }
+
+    private static string? ExtractLevel(string line)
+    {
+        var start = line.IndexOf("ClientLog ", StringComparison.OrdinalIgnoreCase);
+        if (start < 0) return null;
+        var tokens = line[start..].Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        return tokens.Length > 1 ? tokens[1] : null;
+    }
+
+    private static string? ExtractSegment(string text, string start, int tokenIndex)
+    {
+        var index = text.IndexOf(start, StringComparison.OrdinalIgnoreCase);
+        if (index < 0) return null;
+        var tokens = text[index..].Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        return tokens.Length > tokenIndex ? tokens[tokenIndex] : null;
+    }
+
+    private static string? ExtractNamedValue(string text, string prefix)
+    {
+        var index = text.IndexOf(prefix, StringComparison.OrdinalIgnoreCase);
+        if (index < 0) return null;
+        var slice = text[(index + prefix.Length)..];
+        var end = slice.IndexOf(' ');
+        return end < 0 ? slice : slice[..end];
+    }
+}