diff --git a/ToyProject01/src/me/smartstore/Main.java b/ToyProject01/src/me/smartstore/Main.java
new file mode 100644
index 00000000..c4cba66a
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/Main.java
@@ -0,0 +1,12 @@
+package me.smartstore;
+
+import me.smartstore.menu.Lobby;
+
+public class Main {
+    public static void main(String[] args) {
+
+        Lobby.lobbyMenuUI();
+
+
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/customer/Customer.java b/ToyProject01/src/me/smartstore/customer/Customer.java
new file mode 100644
index 00000000..dcb9ed02
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/customer/Customer.java
@@ -0,0 +1,46 @@
+package me.smartstore.customer;
+
+import me.smartstore.group.Group;
+
+import java.util.Objects;
+
+public class Customer {
+    private String customerName;
+    private String customerId;
+    private String customerShoppingTime;
+    private Group customerGroup;
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public String getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(String customerId) {
+        this.customerId = customerId;
+    }
+
+    public String getCustomerShoppingTime() {
+        return customerShoppingTime;
+    }
+
+    public void setCustomerShoppingTime(String customerShoppingTime) {
+        this.customerShoppingTime = customerShoppingTime;
+    }
+
+    public Group getCustomerGroup() {
+        return customerGroup;
+    }
+
+    public void setCustomerGroup(Group customerGroup) {
+        this.customerGroup = customerGroup;
+    }
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/customer/Customers.java b/ToyProject01/src/me/smartstore/customer/Customers.java
new file mode 100644
index 00000000..26c1b17d
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/customer/Customers.java
@@ -0,0 +1,32 @@
+package me.smartstore.customer;
+
+public class Customers extends Customer {
+
+    private static Customers instance;
+
+    private static final int defaultCapacity = 10;
+
+    private Customer[] CustomerArray;
+    private int capacity;
+
+    private Customers() {
+
+        this.CustomerArray = new Customer[defaultCapacity];
+        this.capacity = defaultCapacity;
+    }
+
+    public static Customers getInstance() {
+        if (instance == null) {
+            instance = new Customers();
+        }
+        return instance;
+    }
+
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public void setCapacity(int capacity) {
+        this.capacity = capacity;
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/exception/InvalidFormatInput.java b/ToyProject01/src/me/smartstore/exception/InvalidFormatInput.java
new file mode 100644
index 00000000..ae7fa7d2
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/exception/InvalidFormatInput.java
@@ -0,0 +1,8 @@
+package me.smartstore.exception;
+
+public class InvalidFormatInput extends Exception{
+    private final static String MESSAGE = "Invalid Format for Input. Please try again.";
+    public InvalidFormatInput(){
+        super(MESSAGE);
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/exception/InvalidInputExcetion.java b/ToyProject01/src/me/smartstore/exception/InvalidInputExcetion.java
new file mode 100644
index 00000000..c238ff7b
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/exception/InvalidInputExcetion.java
@@ -0,0 +1,8 @@
+package me.smartstore.exception;
+
+public class InvalidInputExcetion extends Exception{
+    private final static String MESSAGE = "Invalid Input. Please try again.";
+    public InvalidInputExcetion(){
+        super(MESSAGE);
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/group/Group.java b/ToyProject01/src/me/smartstore/group/Group.java
new file mode 100644
index 00000000..f164284e
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/group/Group.java
@@ -0,0 +1,19 @@
+package me.smartstore.group;
+
+public abstract class Group {
+
+    public String groupType;
+    public double time;
+    public double pay;
+
+    abstract void setMinimumTime(double time);
+
+    abstract void setMinimumPay(double pay);
+
+    abstract double getMinimumTime();
+
+    abstract double getMinimumPay();
+
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/group/GroupGeneral.java b/ToyProject01/src/me/smartstore/group/GroupGeneral.java
new file mode 100644
index 00000000..ed37c6cb
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/group/GroupGeneral.java
@@ -0,0 +1,37 @@
+package me.smartstore.group;
+
+public class GroupGeneral extends Group {
+
+
+    public GroupGeneral() {
+        this.groupType = "General";
+    }
+
+    @Override
+    void setMinimumTime(double time) {
+        this.time = time;
+    }
+
+    @Override
+    void setMinimumPay(double pay) {
+        this.pay = pay;
+    }
+
+    @Override
+    double getMinimumTime() {
+        return this.time;
+    }
+
+    @Override
+    double getMinimumPay() {
+        return this.pay;
+    }
+
+    @Override
+    public String toString() {
+        return "parameter{" +
+                "minimumSpentTime=" + time +
+                ", minimumTotalPay=" + pay +
+                '}';
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/group/GroupVIP.java b/ToyProject01/src/me/smartstore/group/GroupVIP.java
new file mode 100644
index 00000000..eef4ed0c
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/group/GroupVIP.java
@@ -0,0 +1,31 @@
+package me.smartstore.group;
+
+public class GroupVIP extends Group{
+
+
+    public GroupVIP() {
+        this.groupType = "VIP";
+    }
+
+    @Override
+    void setMinimumTime(double time) {
+
+    }
+
+    @Override
+    void setMinimumPay(double pay) {
+
+    }
+
+    @Override
+    double getMinimumTime() {
+        return 0;
+    }
+
+    @Override
+    double getMinimumPay() {
+        return 0;
+    }
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/group/GroupVVIP.java b/ToyProject01/src/me/smartstore/group/GroupVVIP.java
new file mode 100644
index 00000000..9adba3ff
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/group/GroupVVIP.java
@@ -0,0 +1,31 @@
+package me.smartstore.group;
+
+public class GroupVVIP extends Group{
+
+
+    public GroupVVIP() {
+        this.groupType = "VVIP";
+    }
+
+    @Override
+    void setMinimumTime(double time) {
+
+    }
+
+    @Override
+    void setMinimumPay(double pay) {
+
+    }
+
+    @Override
+    double getMinimumTime() {
+        return 0;
+    }
+
+    @Override
+    double getMinimumPay() {
+        return 0;
+    }
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/group/Groups.java b/ToyProject01/src/me/smartstore/group/Groups.java
new file mode 100644
index 00000000..b41ecfc4
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/group/Groups.java
@@ -0,0 +1,49 @@
+package me.smartstore.group;
+
+import java.util.Optional;
+
+public class Groups {
+
+    private static Groups instance;
+    private Optional<GroupGeneral> groupGeneral;// 이렇게 optional를 사용하는게 맞는지는 모르겠지만 진행
+    private Optional<GroupVIP> groupVIP;
+    private Optional<GroupVVIP> groupVVIP;
+
+    private Groups(){
+        groupGeneral = Optional.empty();
+        groupVIP = Optional.empty();
+        groupVVIP = Optional.empty();
+
+    }
+
+    public static Groups getInstance(){
+        if(instance == null){
+            instance = new Groups();
+        }
+        return instance;
+    }
+
+    public Optional<GroupGeneral> getGroupGeneral() {
+        return groupGeneral;
+    }
+
+    public void setGroupGeneral(Optional<GroupGeneral> groupGeneral) {
+        this.groupGeneral = groupGeneral;
+    }
+
+    public Optional<GroupVIP> getGroupVIP() {
+        return groupVIP;
+    }
+
+    public void setGroupVIP(Optional<GroupVIP> groupVIP) {
+        this.groupVIP = groupVIP;
+    }
+
+    public Optional<GroupVVIP> getGroupVVIP() {
+        return groupVVIP;
+    }
+
+    public void setGroupVVIP(Optional<GroupVVIP> groupVVIP) {
+        this.groupVVIP = groupVVIP;
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/menu/CustomerData.java b/ToyProject01/src/me/smartstore/menu/CustomerData.java
new file mode 100644
index 00000000..5b17d5b1
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/menu/CustomerData.java
@@ -0,0 +1,9 @@
+package me.smartstore.menu;
+
+public class CustomerData {
+
+    public static void CustomerDataMenu(){
+
+    }
+
+}
diff --git a/ToyProject01/src/me/smartstore/menu/Lobby.java b/ToyProject01/src/me/smartstore/menu/Lobby.java
new file mode 100644
index 00000000..7b6b6e39
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/menu/Lobby.java
@@ -0,0 +1,43 @@
+package me.smartstore.menu;
+
+
+import me.smartstore.exception.InvalidInputExcetion;
+import me.smartstore.scanner.Scan;
+import java.util.Scanner;
+
+public class Lobby {
+
+    public static void lobbyMenuUI() {
+        System.out.println( "==============================\n" +
+                            " 1. Parameter\n" +
+                            " 2. Customer Data\n" +
+                            " 3. Classification Summary\n" +
+                            " 4. Quit\n" +
+                            "==============================");
+       System.out.print("Choose One: ");
+       String in = Scan.getInstance().nextLine();
+
+
+
+       if(in.equals("1")){
+           Parameter.parameterMenu();
+       }else if(in.equals("2")){
+
+       }else if(in.equals("3")){
+
+       }else if(in.equals("4")){// 프로그램 종료
+           System.exit(0);
+       }
+       else{
+           try {
+               throw new InvalidInputExcetion();
+           } catch (InvalidInputExcetion e) {
+               System.out.println(e.getMessage());
+               lobbyMenuUI();
+           }
+       }
+
+    }
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/menu/Parameter.java b/ToyProject01/src/me/smartstore/menu/Parameter.java
new file mode 100644
index 00000000..2baed006
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/menu/Parameter.java
@@ -0,0 +1,39 @@
+package me.smartstore.menu;
+
+import me.smartstore.customer.Customers;
+import me.smartstore.exception.InvalidInputExcetion;
+import me.smartstore.parameter.SetParameter;
+import me.smartstore.parameter.UpdateParameter;
+import me.smartstore.parameter.ViewParameter;
+import me.smartstore.scanner.Scan;
+
+public class Parameter {
+    public static void parameterMenu(){
+        System.out.println("==============================\n" +
+                            " 1. Set Parameter\n" +
+                            " 2. View Parameter\n" +
+                            " 3. Update Parameter\n" +
+                            " 4. Back\n" +
+                            "==============================\n");
+        System.out.print("Choose One: ");
+        String in = Scan.getInstance().nextLine();
+
+        if(in.equals("1")){
+            SetParameter.setParameterMethod();
+        }else if(in.equals("2")){
+            ViewParameter.viewParameterMethod();
+        }else if(in.equals("3")){
+            UpdateParameter.updateParameterMethod();
+        }else if(in.equals("4")){
+            Lobby.lobbyMenuUI();
+        }else{
+            try {
+                throw new InvalidInputExcetion();
+            } catch (InvalidInputExcetion e) {
+                System.out.println(e.getMessage());
+                parameterMenu();
+            }
+        }
+
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/parameter/SetParameter.java b/ToyProject01/src/me/smartstore/parameter/SetParameter.java
new file mode 100644
index 00000000..ab27c461
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/parameter/SetParameter.java
@@ -0,0 +1,90 @@
+package me.smartstore.parameter;
+
+import me.smartstore.exception.InvalidFormatInput;
+import me.smartstore.exception.InvalidInputExcetion;
+import me.smartstore.group.GroupGeneral;
+import me.smartstore.group.Groups;
+import me.smartstore.menu.Parameter;
+import me.smartstore.scanner.Scan;
+
+import java.util.Optional;
+
+public class SetParameter {
+    public static void setParameterMethod() {
+
+        System.out.println("Which group (GENERAL (G), VIP (V), VVIP (VV))?\n" +
+                "** Press 'end', if you want to exit! **");
+        String in = Scan.getInstance().nextLine();
+        if (in.equalsIgnoreCase("G")) {
+            setGeneralParameterMethod();
+        } else if (in.equalsIgnoreCase("V")) {
+            setVipParameterMethod();
+        } else if (in.equalsIgnoreCase("VV")) {
+            setVvipParameterMethod();
+        } else if (in.equals("end")) {
+            System.out.println("END is pressed. Exit this menu.\n");
+            Parameter.parameterMenu();
+        } else {
+            try {
+                throw new InvalidInputExcetion();
+            } catch (InvalidInputExcetion e) {
+                System.out.println(e.getMessage());
+
+            }
+            setParameterMethod();
+        }
+    }
+
+    public static void setGeneralParameterMethod() {
+        Groups groups = Groups.getInstance();
+        if (groups.getGroupGeneral().isPresent()) {
+            String groupType = groups.getGroupGeneral().get().groupType;
+            System.out.println(groupType + " group already exists.\n");
+            System.out.println();
+            System.out.println("GroupType: " + groupType);
+            System.out.println("Parameter: " + groups.getGroupGeneral().get().toString());
+            setParameterMethod();
+
+        } else {
+            System.out.println("==============================\n" +
+                    " 1. Minimum Spent Time\n" +
+                    " 2. Minimum Total Pay\n" +
+                    " 3. Back\n" +
+                    "==============================");
+            String in = Scan.getInstance().nextLine();
+            if(in.equals("1")){
+                setMinimumSpentTime();
+            }else if(in.equals("2")){
+                setMinimumTotalPay();
+            }else if(in.equals("3")){
+
+            }else{
+                try {
+                    throw new InvalidFormatInput();
+                } catch (InvalidFormatInput e) {
+                    System.out.println(e.getMessage());
+
+                }
+            }
+
+        }
+    }
+
+    public static void setVipParameterMethod() {
+
+    }
+
+    public static void setVvipParameterMethod() {
+
+    }
+
+    public static void setMinimumSpentTime(){
+        String in = Scan.getInstance().nextLine();
+    }
+
+    public static void setMinimumTotalPay(){
+
+    }
+
+
+}
diff --git a/ToyProject01/src/me/smartstore/parameter/UpdateParameter.java b/ToyProject01/src/me/smartstore/parameter/UpdateParameter.java
new file mode 100644
index 00000000..dbe72ad5
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/parameter/UpdateParameter.java
@@ -0,0 +1,8 @@
+package me.smartstore.parameter;
+
+public class UpdateParameter {
+
+    public static void updateParameterMethod(){
+
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/parameter/ViewParameter.java b/ToyProject01/src/me/smartstore/parameter/ViewParameter.java
new file mode 100644
index 00000000..6bb9c687
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/parameter/ViewParameter.java
@@ -0,0 +1,13 @@
+package me.smartstore.parameter;
+
+public class ViewParameter {
+
+    public static void viewParameterMethod(){
+
+
+
+
+
+
+    }
+}
diff --git a/ToyProject01/src/me/smartstore/scanner/Scan.java b/ToyProject01/src/me/smartstore/scanner/Scan.java
new file mode 100644
index 00000000..9a93f91e
--- /dev/null
+++ b/ToyProject01/src/me/smartstore/scanner/Scan.java
@@ -0,0 +1,18 @@
+package me.smartstore.scanner;
+
+import java.util.Scanner;
+
+public class Scan {
+
+    private static Scanner instance;
+
+    private Scan(){}
+
+    public static Scanner getInstance(){
+        if(instance == null) {
+            instance = new Scanner(System.in);
+        }
+        return instance;
+    }
+
+}