diff --git a/WelsonJS.Toolkit/WelsonJS.Service/FileEventMonitor.cs b/WelsonJS.Toolkit/WelsonJS.Service/FileEventMonitor.cs
index 070950b..3c36d2a 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/FileEventMonitor.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/FileEventMonitor.cs
@@ -70,13 +70,14 @@ namespace WelsonJS.Service
         private string clamAvConenctionString;
         private IClamAvClient clamAvClient;
 
-        public FileEventMonitor(ServiceBase parent, string workingDirectory)
+        public FileEventMonitor(ServiceBase _parent, string workingDirectory, ILogger _logger)
         {
-            this.parent = (ServiceMain)parent;
+            parent = (ServiceMain)_parent;
+            logger = _logger;
 
             try
             {
-                clamAvConenctionString = this.parent.GetSettingsHandler().Read("CLAMAV_HOST", "Service");
+                clamAvConenctionString = parent.ReadSettingsValue("CLAMAV_HOST");
             }
             catch (Exception ex)
             {
@@ -86,11 +87,6 @@ namespace WelsonJS.Service
             ConnectToClamAv().Start();
         }
 
-        public void SetLogger(ILogger _logger)
-        {
-            logger = _logger;
-        }
-
         public void Start()
         {
             try
diff --git a/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs b/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
index 8eb933d..4bb7fa3 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/HeartbeatClient.cs
@@ -19,19 +19,20 @@ namespace WelsonJS.Service
         private ILogger logger;
         private readonly GrpcChannel _channel;
         private int HeartbeatInterval;
-        private ServiceMain _parent;
+        private ServiceMain parent;
         private string clientId;
         private string serverAddress;
 
-        public HeartbeatClient(ServiceBase parent)
+        public HeartbeatClient(ServiceBase _parent, ILogger _logger)
         {
-            _parent = (ServiceMain)parent;
+            parent = (ServiceMain)_parent;
+            logger = _logger;
 
-            HeartbeatInterval = int.Parse(_parent.GetSettingsHandler().Read("HEARTBEAT_INTERVAL", "Service") ?? "2000");
+            HeartbeatInterval = int.Parse(parent.ReadSettingsValue("HEARTBEAT_INTERVAL") ?? "2000");
 
             try
             {
-                serverAddress = _parent.GetSettingsHandler().Read("GRPC_HOST", "Service");
+                serverAddress = parent.ReadSettingsValue("GRPC_HOST");
                 if (String.IsNullOrEmpty(serverAddress))
                 {
                     throw new Exception("The server address could not be empty.");
@@ -56,11 +57,6 @@ namespace WelsonJS.Service
             logger.LogInformation($"Use the client ID: {clientId}");
         }
 
-        public void SetLogger(ILogger _logger)
-        {
-            logger = _logger;
-        }
-
         public async Task StartHeartbeatAsync()
         {
             while (true)
diff --git a/WelsonJS.Toolkit/WelsonJS.Service/Program.cs b/WelsonJS.Toolkit/WelsonJS.Service/Program.cs
index 8cd105f..5909042 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/Program.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/Program.cs
@@ -1,17 +1,27 @@
-using System;
-using System.Collections.Generic;
+using Microsoft.Extensions.Logging;
+using System;
+using System.IO;
 using System.ServiceProcess;
-using System.Text;
+using WelsonJS.Service.Logging;
 
 namespace WelsonJS.Service
 {
     internal static class Program
     {
+        private static ILogger logger;
+
         /// <summary>
         /// 해당 애플리케이션의 주 진입점입니다.
         /// </summary>
+        /// 
         static void Main(string[] args)
         {
+            // create the logger
+            ILoggerFactory factory = LoggerFactory.Create(builder => builder.AddConsole());
+            factory.AddDirectory(Path.GetTempPath());
+            logger = factory.CreateLogger("welsonjs");
+
+            // create the service
             if (Environment.UserInteractive)
             {
                 Console.WriteLine("WelsonJS Service Application (User Interactive Mode)");
@@ -19,7 +29,7 @@ namespace WelsonJS.Service
                 Console.WriteLine();
                 Console.WriteLine("Service is running...");
 
-                ServiceMain svc = new ServiceMain(args);
+                ServiceMain svc = new ServiceMain(args, logger);
                 svc.TestStartupAndStop();
             }
             else
@@ -27,7 +37,7 @@ namespace WelsonJS.Service
                 ServiceBase[] ServicesToRun;
                 ServicesToRun = new ServiceBase[]
                 {
-                    new ServiceMain(args)
+                    new ServiceMain(args, logger)
                 };
                 ServiceBase.Run(ServicesToRun);
             }
diff --git a/WelsonJS.Toolkit/WelsonJS.Service/ScreenMatch.cs b/WelsonJS.Toolkit/WelsonJS.Service/ScreenMatch.cs
index 051e12d..6e6aff7 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/ScreenMatch.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/ScreenMatch.cs
@@ -159,9 +159,10 @@ public class ScreenMatch
         }
     }
 
-    public ScreenMatch(ServiceBase parent, string workingDirectory)
+    public ScreenMatch(ServiceBase _parent, string workingDirectory, ILogger _logger)
     {
-        this.parent = (ServiceMain)parent;
+        parent = (ServiceMain)_parent;
+        logger = _logger;
 
         SetBusy(false);
 
@@ -193,8 +194,8 @@ public class ScreenMatch
         string screen_time_params;
         try
         {
-            screen_time_mode = this.parent.GetSettingsHandler().Read("SCREEN_TIME_MODE", "Service");
-            screen_time_params = this.parent.GetSettingsHandler().Read("SCREEN_TIME_PARAMS", "Service");
+            screen_time_mode = parent.ReadSettingsValue("SCREEN_TIME_MODE");
+            screen_time_params = parent.ReadSettingsValue("SCREEN_TIME_PARAMS");
         }
         catch (Exception ex)
         {
@@ -332,11 +333,6 @@ public class ScreenMatch
         LoadTemplateImages();
     }
 
-    public void SetLogger(ILogger _logger)
-    {
-        logger = _logger;
-    }
-
     public void SetMode(string mode)
     {
         if (!String.IsNullOrEmpty(mode))
diff --git a/WelsonJS.Toolkit/WelsonJS.Service/ServiceMain.cs b/WelsonJS.Toolkit/WelsonJS.Service/ServiceMain.cs
index e5d436c..5c45fe1 100644
--- a/WelsonJS.Toolkit/WelsonJS.Service/ServiceMain.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Service/ServiceMain.cs
@@ -36,7 +36,6 @@ using System.Collections;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using WelsonJS.Service.Logging;
-using Grpc.Core.Logging;
 
 namespace WelsonJS.Service
 {
@@ -44,7 +43,7 @@ namespace WelsonJS.Service
     {
         private readonly static string applicationName = "WelsonJS";
         private static List<Timer> timers;
-        private Microsoft.Extensions.Logging.ILogger logger;
+        private ILogger logger;
         private string workingDirectory;
         private string scriptName;
         private string scriptFilePath;
@@ -56,7 +55,7 @@ namespace WelsonJS.Service
         private bool disabledFileMonitor = false;
         private ScreenMatch screenMatcher;
         private FileEventMonitor fileEventMonitor;
-        private IniFile settingsHandler;
+        private IniFile settingsFileHandler;
         private UserVariables userVariablesHandler;
 
         [DllImport("user32.dll")]
@@ -64,17 +63,13 @@ namespace WelsonJS.Service
 
         private static int SM_REMOTESESSION = 0x1000;
 
-        public ServiceMain(string[] args)
+        public ServiceMain(string[] _args, ILogger _logger)
         {
             InitializeComponent();
 
-            // set service arguments
-            this.args = args;
-
-            // set the logger
-            ILoggerFactory factory = LoggerFactory.Create(builder => builder.AddConsole());
-            factory.AddDirectory(Path.GetTempPath());
-            logger = factory.CreateLogger(applicationName.ToLower());
+            // set arguments and logger
+            args = _args;
+            logger = _logger;
 
             // mapping arguments to each variables
             var arguments = ParseArguments(this.args);
@@ -131,11 +126,11 @@ namespace WelsonJS.Service
             {
                 try
                 {
-                    settingsHandler = new IniFile(settingsFilePath);
+                    settingsFileHandler = new IniFile(settingsFilePath);
                 }
-                catch (Exception)
+                catch (Exception ex)
                 {
-                    settingsHandler = null;
+                    logger.LogWarning(ex.Message);
                 }
             }
             else
@@ -144,7 +139,7 @@ namespace WelsonJS.Service
             }
 
             // read configrations from settings.ini
-            if (settingsHandler != null)
+            if (settingsFileHandler != null)
             {
                 string[] configNames = new string[]
                 {
@@ -156,7 +151,7 @@ namespace WelsonJS.Service
                 {
                     try
                     {
-                        if ("true" == GetSettingsHandler().Read(configName, "Service"))
+                        if ("true" == ReadSettingsValue(configName))
                         {
                             switch (configName)
                             {
@@ -197,8 +192,7 @@ namespace WelsonJS.Service
             // start the heartbeat
             if (!disabledHeartbeat)
             {
-                HeartbeatClient heartbeatClient = new HeartbeatClient(this);
-                heartbeatClient.SetLogger(logger);
+                HeartbeatClient heartbeatClient = new HeartbeatClient(this, logger);
                 Task.Run(heartbeatClient.StartHeartbeatAsync);
                 Task.Run(heartbeatClient.StartEventListenerAsync);
             }
@@ -213,7 +207,7 @@ namespace WelsonJS.Service
 
             // check this session is the user interactive mode
             if (Environment.UserInteractive) {
-                this.OnUserInteractiveEnvironment();
+                OnUserInteractiveEnvironment();
             }
             else
             {
@@ -223,9 +217,17 @@ namespace WelsonJS.Service
             logger.LogInformation(applicationName + " Service Loaded");
         }
 
-        public IniFile GetSettingsHandler()
+        public string ReadSettingsValue(string key, string defaultValue = null)
         {
-            return settingsHandler;
+            if (settingsFileHandler != null)
+            {
+                return settingsFileHandler.Read(key, "Service") ?? defaultValue;
+            }
+            else
+            {
+                logger.LogWarning("Unable to read the value. It seems that settings.ini is not configured correctly.");
+                return defaultValue;
+            }
         }
 
         public UserVariables GetUserVariablesHandler()
@@ -302,8 +304,7 @@ namespace WelsonJS.Service
             // Trace a Sysmon file events (If Sysinternals Sysmon installed)
             if (!disabledFileMonitor)
             {
-                fileEventMonitor = new FileEventMonitor(this, workingDirectory);
-                fileEventMonitor.SetLogger(logger);
+                fileEventMonitor = new FileEventMonitor(this, workingDirectory, logger);
                 fileEventMonitor.Start();
 
                 logger.LogInformation("File Event Monitor Started");
@@ -354,8 +355,7 @@ namespace WelsonJS.Service
             // set screen timer
             if (!disabledScreenTime)
             {
-                screenMatcher = new ScreenMatch(this, workingDirectory);
-                screenMatcher.SetLogger(logger);
+                screenMatcher = new ScreenMatch(this, workingDirectory, logger);
 
                 Timer screenTimer = new Timer
                 {