diff --git a/build.gradle.kts b/build.gradle.kts
index 99ca9d4..43c14fd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -43,6 +43,7 @@ allprojects {
         maven("https://repo.infernalsuite.com/repository/maven-releases/")
         maven("https://repo.rapture.pw/repository/maven-releases/")
         maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
+        maven("https://repo.xenondevs.xyz/releases/")
     }
 }
 
diff --git a/gui-plugin/.gitignore b/gui-plugin/.gitignore
new file mode 100644
index 0000000..b63da45
--- /dev/null
+++ b/gui-plugin/.gitignore
@@ -0,0 +1,42 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/gui-plugin/build.gradle.kts b/gui-plugin/build.gradle.kts
new file mode 100644
index 0000000..7c65573
--- /dev/null
+++ b/gui-plugin/build.gradle.kts
@@ -0,0 +1,13 @@
+dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.20.4-R0.1-SNAPSHOT")
+    compileOnly(project(":api"))
+    implementation("xyz.xenondevs.invui:invui:1.27") {
+        exclude("org.jetbrains")
+    }
+}
+
+tasks {
+    shadowJar {
+        relocate ("xyz.xenondevs", "net.momirealms.customcrops.libraries")
+    }
+}
\ No newline at end of file
diff --git a/gui-plugin/src/main/java/net/momirealms/customcrops/gui/CustomCropsGUI.java b/gui-plugin/src/main/java/net/momirealms/customcrops/gui/CustomCropsGUI.java
new file mode 100644
index 0000000..158ee0b
--- /dev/null
+++ b/gui-plugin/src/main/java/net/momirealms/customcrops/gui/CustomCropsGUI.java
@@ -0,0 +1,21 @@
+package net.momirealms.customcrops.gui;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class CustomCropsGUI extends JavaPlugin {
+
+    private static CustomCropsGUI instance;
+
+    @Override
+    public void onEnable() {
+        instance = this;
+    }
+
+    @Override
+    public void onDisable() {
+    }
+
+    public static CustomCropsGUI getInstance() {
+        return instance;
+    }
+}
diff --git a/gui-plugin/src/main/java/net/momirealms/customcrops/gui/GUIManager.java b/gui-plugin/src/main/java/net/momirealms/customcrops/gui/GUIManager.java
new file mode 100644
index 0000000..1ae4af4
--- /dev/null
+++ b/gui-plugin/src/main/java/net/momirealms/customcrops/gui/GUIManager.java
@@ -0,0 +1,16 @@
+package net.momirealms.customcrops.gui;
+
+import net.momirealms.customcrops.api.event.PotInteractEvent;
+import org.bukkit.Material;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+
+public class GUIManager implements Listener {
+
+    @EventHandler (ignoreCancelled = true)
+    public void onInteractPot(PotInteractEvent event) {
+        if (event.getItemInHand().getType() != Material.AIR)
+            return;
+
+    }
+}
diff --git a/gui-plugin/src/main/resources/config.yml b/gui-plugin/src/main/resources/config.yml
new file mode 100644
index 0000000..e69de29
diff --git a/gui-plugin/src/main/resources/plugin.yml b/gui-plugin/src/main/resources/plugin.yml
new file mode 100644
index 0000000..9da86ef
--- /dev/null
+++ b/gui-plugin/src/main/resources/plugin.yml
@@ -0,0 +1,9 @@
+name: CustomCrops
+version: '${version}'
+main: net.momirealms.customcrops.gui.CustomCropsGUI
+api-version: 1.17
+load: POSTWORLD
+authors: [ XiaoMoMi ]
+folia-supported: true
+depend:
+  - CustomCrops
\ No newline at end of file
diff --git a/plugin/src/main/java/net/momirealms/customcrops/mechanic/requirement/RequirementManagerImpl.java b/plugin/src/main/java/net/momirealms/customcrops/mechanic/requirement/RequirementManagerImpl.java
index 9ba82c1..1e0ee34 100644
--- a/plugin/src/main/java/net/momirealms/customcrops/mechanic/requirement/RequirementManagerImpl.java
+++ b/plugin/src/main/java/net/momirealms/customcrops/mechanic/requirement/RequirementManagerImpl.java
@@ -586,6 +586,22 @@ public class RequirementManagerImpl implements RequirementManager {
     }
 
     private void registerNumberEqualRequirement() {
+        registerRequirement("=", (args, actions, advanced) -> {
+            if (args instanceof ConfigurationSection section) {
+                String v1 = section.getString("value1", "");
+                String v2 = section.getString("value2", "");
+                return state -> {
+                    String p1 = v1.startsWith("%") ? ParseUtils.setPlaceholders(state.getPlayer(), v1) : v1;
+                    String p2 = v2.startsWith("%") ? ParseUtils.setPlaceholders(state.getPlayer(), v2) : v2;
+                    if (Double.parseDouble(p1) == Double.parseDouble(p2)) return true;
+                    if (advanced) triggerActions(actions, state);
+                    return false;
+                };
+            } else {
+                LogUtils.warn("Wrong value format found at = requirement.");
+                return EmptyRequirement.instance;
+            }
+        });
         registerRequirement("==", (args, actions, advanced) -> {
             if (args instanceof ConfigurationSection section) {
                 String v1 = section.getString("value1", "");
@@ -598,7 +614,7 @@ public class RequirementManagerImpl implements RequirementManager {
                     return false;
                 };
             } else {
-                LogUtils.warn("Wrong value format found at !startsWith requirement.");
+                LogUtils.warn("Wrong value format found at == requirement.");
                 return EmptyRequirement.instance;
             }
         });
@@ -614,7 +630,7 @@ public class RequirementManagerImpl implements RequirementManager {
                     return false;
                 };
             } else {
-                LogUtils.warn("Wrong value format found at !startsWith requirement.");
+                LogUtils.warn("Wrong value format found at != requirement.");
                 return EmptyRequirement.instance;
             }
         });
@@ -857,7 +873,7 @@ public class RequirementManagerImpl implements RequirementManager {
                     return false;
                 };
             } else {
-                LogUtils.warn("Wrong value format found at in-list requirement.");
+                LogUtils.warn("Wrong value format found at !in-list requirement.");
                 return EmptyRequirement.instance;
             }
         });
@@ -946,7 +962,7 @@ public class RequirementManagerImpl implements RequirementManager {
     private void registerPotionEffectRequirement() {
         registerRequirement("potion-effect", (args, actions, advanced) -> {
             String potions = (String) args;
-            String[] split = potions.split("(<=|>=|<|>|==)", 2);
+            String[] split = potions.split("(<=|>=|<|>|==|=)", 2);
             PotionEffectType type = PotionEffectType.getByName(split[0]);
             if (type == null) {
                 LogUtils.warn("Potion effect doesn't exist: " + split[0]);
@@ -969,7 +985,7 @@ public class RequirementManagerImpl implements RequirementManager {
                     case ">" -> {
                         if (level > required) result = true;
                     }
-                    case "==" -> {
+                    case "==", "=" -> {
                         if (level == required) result = true;
                     }
                     case "!=" -> {
diff --git a/settings.gradle b/settings.gradle
index 3b4dbf8..a5b54b7 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,5 +1,6 @@
 rootProject.name = 'CustomCrops'
 include(":plugin")
 include(":api")
-include 'legacy-api'
+include(":legacy-api")
+include(":gui-plugin")