diff --git a/scorebored/src/lib/firebase/firebase.ts b/scorebored/src/lib/firebase/firebase.ts
index c04656a..0f56d61 100644
--- a/scorebored/src/lib/firebase/firebase.ts
+++ b/scorebored/src/lib/firebase/firebase.ts
@@ -6,7 +6,7 @@ import { writable, derived } from "svelte/store";
 
 // Your web app's Firebase configuration (Replace with your actual config)
 const firebaseConfig = {
-  apiKey: import.meta.env.VITE_APIKEY,
+  apiKey: import.meta.env.VITE_API_KEY,
   authDomain: "scorebored2-e7ffd.firebaseapp.com",
   databaseURL: "https://scorebored2-e7ffd-default-rtdb.firebaseio.com",
   projectId: "scorebored2-e7ffd",
diff --git a/scorebored/src/routes/login/username/+page.svelte b/scorebored/src/routes/login/username/+page.svelte
index 0c6f605..d630c1e 100644
--- a/scorebored/src/routes/login/username/+page.svelte
+++ b/scorebored/src/routes/login/username/+page.svelte
@@ -1,29 +1,22 @@
 <script lang="ts">
   import AuthCheck from "$lib/components/AuthCheck.svelte";
   import { db } from "$lib/firebase/firebase";
-  import { doc, getDoc, writeBatch } from "firebase/firestore";
+  import { doc, getDoc, setDoc, onSnapshot, collection } from "firebase/firestore";
   import { getAuth, onAuthStateChanged } from "firebase/auth";
   import { onMount } from 'svelte';
 
   let BoardID = "";
   let BoardName = '';
-  let datapoints = []; // 예시: [1.0, 2.0, 3.0]
+  let datapoints = [];
   let isQuantity = false;
   let X_axis = '';
   let Y_axis = '';
   let numTarget = 0;
   let timeTarget = 0;
   let lastEdited = new Date();
-  let Username = ''; // 사용자 컬렉션에 추가할 필드
-  let loading = false;
-  let isAvailable = false;
-  let debounceTimer;
+  let Username = '';
   let currentUser = null;
-
-  const re = /^(?=[a-zA-Z0-9._]{3,16}$)(?!.*[_.]{2})[^_.].*[^_.]$/;
-  $: isValid = BoardID?.length > 2 && BoardID.length < 16 && re.test(BoardID);
-  $: isTouched = BoardID.length > 0;
-  $: isTaken = isValid && !isAvailable && !loading;
+  let referenceArray = [];
 
   onMount(() => {
     const auth = getAuth();
@@ -36,16 +29,87 @@
     });
   });
 
-  async function checkAvailability() {
-    isAvailable = false;
-    clearTimeout(debounceTimer);
-    loading = true;
-    debounceTimer = setTimeout(async () => {
-      const ref = doc(db, "user", BoardID);
-      const docSnap = await getDoc(ref);
-      isAvailable = !docSnap.exists();
-      loading = false;
-    }, 500);
+  async function loadBoardData() {
+    if (!BoardID) {
+      console.error("No BoardID provided");
+      return;
+    }
+
+    try {
+      const boardRef = doc(db, "scoreboard", BoardID);
+      const boardSnap = await getDoc(boardRef);
+
+      if (boardSnap.exists()) {
+        const boardData = boardSnap.data();
+        BoardName = boardData.BoardName;
+        datapoints = boardData.datapoints;
+        isQuantity = boardData.isQuantity;
+        X_axis = boardData.X_axis;
+        Y_axis = boardData.Y_axis;
+        numTarget = boardData.numTarget;
+        timeTarget = boardData.timeTarget;
+        referenceArray = boardData.referenceArray || [];
+        await initializeDatapoints();
+        monitorChildBoards();
+      } else {
+        console.error("No such document!");
+      }
+    } catch (error) {
+      console.error("Error loading board data:", error);
+    }
+  }
+
+  async function initializeDatapoints() {
+    if (!isQuantity) {
+      await Promise.all(referenceArray.map(async (childBoardID, index) => {
+        if (childBoardID) {
+          const childBoardRef = doc(db, "scoreboard", childBoardID);
+          const childBoardSnap = await getDoc(childBoardRef);
+          if (childBoardSnap.exists()) {
+            const childBoardData = childBoardSnap.data();
+            datapoints[index] = childBoardData.isCompleted;
+          }
+        }
+      }));
+      // 강제 업데이트를 위해 Svelte의 상태를 업데이트
+      datapoints = [...datapoints];
+    }
+  }
+
+  function addDatapoint() {
+    datapoints.push(isQuantity ? 0 : false);
+    if (!isQuantity) {
+      referenceArray.push('');
+    }
+  }
+
+  function removeDatapoint(index) {
+    datapoints.splice(index, 1);
+    if (!isQuantity) {
+      referenceArray.splice(index, 1);
+    }
+  }
+
+  function updateDatapoint(value, index) {
+    datapoints[index] = isQuantity ? parseFloat(value) : value === 'true';
+  }
+
+  function monitorChildBoards() {
+    if (!isQuantity) {
+      referenceArray.forEach((childBoardID, index) => {
+        if (childBoardID) {
+          const childBoardRef = doc(db, "scoreboard", childBoardID);
+          onSnapshot(childBoardRef, (doc) => {
+            const childBoardData = doc.data();
+            if (childBoardData && childBoardData.isCompleted !== undefined) {
+              datapoints[index] = childBoardData.isCompleted;
+              // 강제 업데이트를 위해 Svelte의 상태를 업데이트
+              datapoints = [...datapoints];
+            }
+          });
+        }
+      });
+    }
   }
 
   async function confirmBoardID() {
@@ -53,12 +117,13 @@
       console.error("User not found");
       return;
     }
-    const uid = currentUser.uid;
 
-    const batch = writeBatch(db);
-    batch.set(doc(db, "user", uid), { uid: uid, Username: Username });
-    batch.set(doc(db, "scoreboard", BoardID), {
-      uid,
+    let isCompleted = isQuantity ? datapoints.reduce((sum, value) => sum + value, 0) >= numTarget : datapoints.every(value => value === true);
+
+    const scoreboardRef = BoardID ? doc(db, "scoreboard", BoardID) : doc(collection(db, "scoreboard"));
+
+    await setDoc(scoreboardRef, {
+      uid: currentUser.uid,
       BoardName,
       datapoints,
       isQuantity,
@@ -66,16 +131,20 @@
       Y_axis,
       numTarget,
       timeTarget,
-      lastEdited: lastEdited.toISOString()
+      isCompleted,
+      lastEdited: lastEdited.toISOString(),
+      referenceArray
     });
 
-    try {
-      await batch.commit();
-    } catch (error) {
-      console.error("Error in batch commit:", error);
+    if (!BoardID) {
+      BoardID = scoreboardRef.id;
     }
 
-    BoardID = '';
+    await setDoc(doc(db, "user", currentUser.uid), {
+      uid: currentUser.uid,
+      Username: Username
+    });
+
     BoardName = '';
     datapoints = [];
     isQuantity = false;
@@ -85,67 +154,50 @@
     timeTarget = 0;
     lastEdited = new Date();
     Username = '';
-    isAvailable = false;
   }
 </script>
 
 <AuthCheck>
   <form class="w-2/5" on:submit|preventDefault={confirmBoardID}>
-    <input
-      type="text"
-      placeholder="BoardID"
-      class="input w-full"
-      bind:value={BoardID}
-      on:input={checkAvailability}
-      class:input-error={(!isValid && isTouched)}
-      class:input-warning={isTaken}
-      class:input-success={isAvailable && isValid && !loading}
-    />
-    <input
-      type="text"
-      placeholder="Username"
-      class="input w-full my-2"
-      bind:value={Username}
-    />
-    <input
-      type="text"
-      placeholder="Board Name"
-      class="input w-full my-2"
-      bind:value={BoardName}
-    />
-    <!-- datapoints 및 기타 필드를 위한 추가적인 입력 필드가 필요합니다. -->
-    <!-- 예시: <input type="text" placeholder="Data Points" ...> -->
-    <input
-      type="checkbox"
-      class="checkbox"
-      bind:checked={isQuantity}
-    /> Is Quantity?
-    <input
-      type="text"
-      placeholder="X Axis"
-      class="input w-full my-2"
-      bind:value={X_axis}
-    />
-    <input
-      type="text"
-      placeholder="Y Axis"
-      class="input w-full my-2"
-      bind:value={Y_axis}
-    />
-    <input
-      type="number"
-      placeholder="Number Target"
-      class="input w-full my-2"
-      bind:value={numTarget}
-    />
-    <input
-      type="number"
-      placeholder="Time Target"
-      class="input w-full my-2"
-      bind:value={timeTarget}
-    />
-    <button class="btn btn-success" type="submit" disabled={!isValid || !isAvailable || loading}>
-      Confirm BoardID
-    </button>
+    <div class="text-lg font-bold my-2">
+      Board ID: 
+      <input type="text" class="input w-full my-2" bind:value={BoardID} />
+      <button class="btn btn-primary" type="button" on:click={loadBoardData}>Load Board Data</button>
+    </div>
+    <input type="text" placeholder="Board Name" class="input w-full my-2" bind:value={BoardName} />
+    <input type="checkbox" class="checkbox" bind:checked={isQuantity} /> Is Quantity?
+    <input type="text" placeholder="X Axis" class="input w-full my-2" bind:value={X_axis} />
+    <input type="text" placeholder="Y Axis" class="input w-full my-2" bind:value={Y_axis} />
+    <input type="number" placeholder="Number Target" class="input w-full my-2" bind:value={numTarget} />
+    <input type="number" placeholder="Time Target" class="input w-full my-2" bind:value={timeTarget} />
+    
+    <div>
+      <button type="button" on:click={addDatapoint}>Add Datapoint</button>
+      {#each datapoints as datapoint, index}
+        <div class="flex items-center my-2">
+          {#if isQuantity}
+            <input
+              type="number"
+              class="input"
+              bind:value={datapoints[index]}
+            />
+          {:else}
+            <input
+              type="text"
+              class="input"
+              placeholder="Child Board ID"
+              bind:value={referenceArray[index]}
+            />
+            <select bind:value={datapoints[index]} on:change={(event) => updateDatapoint(event.target.value, index)}>
+              <option value="true" selected={datapoint === true}>True</option>
+              <option value="false" selected={datapoint === false}>False</option>
+            </select>
+          {/if}
+          <button type="button" on:click={() => removeDatapoint(index)}>Remove</button>
+        </div>
+      {/each}
+    </div>
+
+    <button class="btn btn-success" type="submit">Confirm BoardID</button>
   </form>
 </AuthCheck>