diff --git a/design-pattern/gof/src/builder/after/App.java b/design-pattern/gof/src/builder/after/App.java
new file mode 100644
index 00000000..8681ea95
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/App.java
@@ -0,0 +1,27 @@
+package builder.after;
+
+import java.time.LocalDate;
+
+public class App {
+
+    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
+//        TourPlanBuilder builder = new DefaultTourBuilder();
+//        TourPlan plan = builder.title("칸쿤 여행")
+//                .nightsAndDays(2, 3)
+//                .startDate(LocalDate.of(2021, 12, 24))
+//                .whereToStay("리조트")
+//                .addPlan(0, "체크인 하고 짐 풀기")
+//                .addPlan(0, "저녁 식사")
+//                .getPlan();
+//
+//        TourPlan longBeachTrip = builder.title("롱비치")
+//                .startDate(LocalDate.of(2022, 1, 1))
+//                .getPlan();
+        TourDirector director = new TourDirector(new DefaultTourBuilder());
+        TourPlan tourPlan = director.cancunTrip();
+        TourPlan tourPlan1 = director.longBeachTrip();
+
+        System.out.println("tourPlan = " + tourPlan);
+        System.out.println("tourPlan1 = " + tourPlan1);
+    }
+}
diff --git a/design-pattern/gof/src/builder/after/DefaultTourBuilder.java b/design-pattern/gof/src/builder/after/DefaultTourBuilder.java
new file mode 100644
index 00000000..c07dd1bd
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/DefaultTourBuilder.java
@@ -0,0 +1,54 @@
+package builder.after;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DefaultTourBuilder implements TourPlanBuilder{
+
+    private String title;
+    private int nights;
+    private int days;
+    private LocalDate startDate;
+    private String whereToStay;
+    private List<DetailPlan> plans;
+
+    @Override
+    public TourPlanBuilder title(String title) {
+        this.title = title;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder nightsAndDays(int nights, int days) {
+        this.nights = nights;
+        this.days = days;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder startDate(LocalDate startDate) {
+        this.startDate = startDate;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder whereToStay(String whereToStay) {
+        this.whereToStay = whereToStay;
+        return this;
+    }
+
+    @Override
+    public TourPlanBuilder addPlan(int day, String plan) {
+        if (this.plans == null) {
+            plans = new ArrayList<>();
+        }
+        this.plans.add(new DetailPlan(day, plan));
+        return this;
+    }
+
+    @Override
+    public TourPlan getPlan() {
+        return new TourPlan(title, nights, days, startDate, whereToStay, plans);
+    }
+}
diff --git a/design-pattern/gof/src/builder/after/DetailPlan.java b/design-pattern/gof/src/builder/after/DetailPlan.java
new file mode 100644
index 00000000..6ad818a8
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/DetailPlan.java
@@ -0,0 +1,37 @@
+package builder.after;
+
+public class DetailPlan {
+
+    private int day;
+
+    private String plan;
+
+    public DetailPlan(int day, String plan) {
+        this.day = day;
+        this.plan = plan;
+    }
+
+    public int getDay() {
+        return day;
+    }
+
+    public void setDay(int day) {
+        this.day = day;
+    }
+
+    public String getPlan() {
+        return plan;
+    }
+
+    public void setPlan(String plan) {
+        this.plan = plan;
+    }
+
+    @Override
+    public String toString() {
+        return "DetailPlan{" +
+                "day=" + day +
+                ", plan='" + plan + '\'' +
+                '}';
+    }
+}
diff --git a/design-pattern/gof/src/builder/after/TourDirector.java b/design-pattern/gof/src/builder/after/TourDirector.java
new file mode 100644
index 00000000..e7a8d6a2
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/TourDirector.java
@@ -0,0 +1,30 @@
+package builder.after;
+
+import java.time.LocalDate;
+
+public class TourDirector {
+
+    private final TourPlanBuilder tourPlanBuilder;
+
+    public TourDirector(TourPlanBuilder tourPlanBuilder) {
+        this.tourPlanBuilder = tourPlanBuilder;
+    }
+
+    public TourPlan cancunTrip() throws InstantiationException, IllegalAccessException {
+        TourPlanBuilder builder = tourPlanBuilder.getClass().newInstance();
+        return builder.title("칸쿤 여행")
+                .nightsAndDays(2, 3)
+                .startDate(LocalDate.of(2021, 12, 24))
+                .whereToStay("리조트")
+                .addPlan(0, "체크인 하고 짐 풀기")
+                .addPlan(0, "저녁 식사")
+                .getPlan();
+    }
+
+    public TourPlan longBeachTrip() throws InstantiationException, IllegalAccessException {
+        TourPlanBuilder builder = tourPlanBuilder.getClass().newInstance();
+        return builder.title("롱비치")
+                .startDate(LocalDate.of(2022, 1, 1))
+                .getPlan();
+    }
+}
diff --git a/design-pattern/gof/src/builder/after/TourPlan.java b/design-pattern/gof/src/builder/after/TourPlan.java
new file mode 100644
index 00000000..249cf8d0
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/TourPlan.java
@@ -0,0 +1,95 @@
+package builder.after;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public class TourPlan {
+
+    private String title;
+
+    private int nights;
+
+    private int days;
+
+    private LocalDate startDate;
+
+    private String whereToStay;
+
+    private List<DetailPlan> plans;
+
+    public TourPlan() {
+    }
+
+    public TourPlan(String title, int nights, int days, LocalDate startDate, String whereToStay, List<DetailPlan> plans) {
+        this.title = title;
+        this.nights = nights;
+        this.days = days;
+        this.startDate = startDate;
+        this.whereToStay = whereToStay;
+        this.plans = plans;
+    }
+
+    @Override
+    public String toString() {
+        return "TourPlan{" +
+                "title='" + title + '\'' +
+                ", nights=" + nights +
+                ", days=" + days +
+                ", startDate=" + startDate +
+                ", whereToStay='" + whereToStay + '\'' +
+                ", plans=" + plans +
+                '}';
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public int getNights() {
+        return nights;
+    }
+
+    public void setNights(int nights) {
+        this.nights = nights;
+    }
+
+    public int getDays() {
+        return days;
+    }
+
+    public void setDays(int days) {
+        this.days = days;
+    }
+
+    public LocalDate getStartDate() {
+        return startDate;
+    }
+
+    public void setStartDate(LocalDate startDate) {
+        this.startDate = startDate;
+    }
+
+    public String getWhereToStay() {
+        return whereToStay;
+    }
+
+    public void setWhereToStay(String whereToStay) {
+        this.whereToStay = whereToStay;
+    }
+
+    public List<DetailPlan> getPlans() {
+        return plans;
+    }
+
+    public void setPlans(List<DetailPlan> plans) {
+        this.plans = plans;
+    }
+
+    public void addPlan(int day, String plan) {
+        this.plans.add(new DetailPlan(day, plan));
+    }
+}
diff --git a/design-pattern/gof/src/builder/after/TourPlanBuilder.java b/design-pattern/gof/src/builder/after/TourPlanBuilder.java
new file mode 100644
index 00000000..230393c8
--- /dev/null
+++ b/design-pattern/gof/src/builder/after/TourPlanBuilder.java
@@ -0,0 +1,18 @@
+package builder.after;
+
+import java.time.LocalDate;
+
+public interface TourPlanBuilder {
+
+    TourPlanBuilder title(String title);
+
+    TourPlanBuilder nightsAndDays(int nights, int days);
+
+    TourPlanBuilder startDate(LocalDate startDate);
+
+    TourPlanBuilder whereToStay(String whereToStay);
+
+    TourPlanBuilder addPlan(int day, String plan);
+
+    TourPlan getPlan();
+}
diff --git a/design-pattern/gof/src/builder/before/App.java b/design-pattern/gof/src/builder/before/App.java
new file mode 100644
index 00000000..b70ed6a0
--- /dev/null
+++ b/design-pattern/gof/src/builder/before/App.java
@@ -0,0 +1,31 @@
+package builder.before;
+
+import builder.after.TourPlan;
+
+import java.time.LocalDate;
+
+public class App {
+
+    public static void main(String[] args) {
+        TourPlan shortTrip = new TourPlan();
+        shortTrip.setTitle("오레곤 롱비치 여행");
+        shortTrip.setStartDate(LocalDate.of(2021, 7, 15));
+
+
+        TourPlan tourPlan = new TourPlan();
+        tourPlan.setTitle("칸쿤 여행");
+        tourPlan.setNights(2);
+        tourPlan.setDays(3);
+        tourPlan.setStartDate(LocalDate.of(2020, 12, 9));
+        tourPlan.setWhereToStay("리조트");
+        tourPlan.addPlan(0, "체크인 이후 짐풀기");
+        tourPlan.addPlan(0, "저녁 식사");
+        tourPlan.addPlan(1, "조식 부페에서 식사");
+        tourPlan.addPlan(1, "해변가 산책");
+        tourPlan.addPlan(1, "점심은 수영장 근처 음식점에서 먹기");
+        tourPlan.addPlan(1, "리조트 수영장에서 놀기");
+        tourPlan.addPlan(1, "저녁은 BBQ 식당에서 스테이크");
+        tourPlan.addPlan(2, "조식 부페에서 식사");
+        tourPlan.addPlan(2, "체크아웃");
+    }
+}
diff --git a/design-pattern/gof/src/builder/before/DetailPlan.java b/design-pattern/gof/src/builder/before/DetailPlan.java
new file mode 100644
index 00000000..b18bb1cb
--- /dev/null
+++ b/design-pattern/gof/src/builder/before/DetailPlan.java
@@ -0,0 +1,37 @@
+package builder.before;
+
+public class DetailPlan {
+
+    private int day;
+
+    private String plan;
+
+    public DetailPlan(int day, String plan) {
+        this.day = day;
+        this.plan = plan;
+    }
+
+    public int getDay() {
+        return day;
+    }
+
+    public void setDay(int day) {
+        this.day = day;
+    }
+
+    public String getPlan() {
+        return plan;
+    }
+
+    public void setPlan(String plan) {
+        this.plan = plan;
+    }
+
+    @Override
+    public String toString() {
+        return "DetailPlan{" +
+                "day=" + day +
+                ", plan='" + plan + '\'' +
+                '}';
+    }
+}
diff --git a/design-pattern/gof/src/builder/before/TourPlan.java b/design-pattern/gof/src/builder/before/TourPlan.java
new file mode 100644
index 00000000..e7947298
--- /dev/null
+++ b/design-pattern/gof/src/builder/before/TourPlan.java
@@ -0,0 +1,95 @@
+package builder.before;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public class TourPlan {
+
+    private String title;
+
+    private int nights;
+
+    private int days;
+
+    private LocalDate startDate;
+
+    private String whereToStay;
+
+    private List<DetailPlan> plans;
+
+    public TourPlan() {
+    }
+
+    public TourPlan(String title, int nights, int days, LocalDate startDate, String whereToStay, List<DetailPlan> plans) {
+        this.title = title;
+        this.nights = nights;
+        this.days = days;
+        this.startDate = startDate;
+        this.whereToStay = whereToStay;
+        this.plans = plans;
+    }
+
+    @Override
+    public String toString() {
+        return "TourPlan{" +
+                "title='" + title + '\'' +
+                ", nights=" + nights +
+                ", days=" + days +
+                ", startDate=" + startDate +
+                ", whereToStay='" + whereToStay + '\'' +
+                ", plans=" + plans +
+                '}';
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public int getNights() {
+        return nights;
+    }
+
+    public void setNights(int nights) {
+        this.nights = nights;
+    }
+
+    public int getDays() {
+        return days;
+    }
+
+    public void setDays(int days) {
+        this.days = days;
+    }
+
+    public LocalDate getStartDate() {
+        return startDate;
+    }
+
+    public void setStartDate(LocalDate startDate) {
+        this.startDate = startDate;
+    }
+
+    public String getWhereToStay() {
+        return whereToStay;
+    }
+
+    public void setWhereToStay(String whereToStay) {
+        this.whereToStay = whereToStay;
+    }
+
+    public List<DetailPlan> getPlans() {
+        return plans;
+    }
+
+    public void setPlans(List<DetailPlan> plans) {
+        this.plans = plans;
+    }
+
+    public void addPlan(int day, String plan) {
+        this.plans.add(new DetailPlan(day, plan));
+    }
+}