diff --git "a/ksinji/202512/14 BOJ \355\206\240\353\247\210\355\206\240.md" "b/ksinji/202512/14 BOJ \355\206\240\353\247\210\355\206\240.md"
new file mode 100644
index 00000000..9cfa2501
--- /dev/null
+++ "b/ksinji/202512/14 BOJ \355\206\240\353\247\210\355\206\240.md"	
@@ -0,0 +1,82 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int n, m, h;
+    static int[][][] box;
+    static Queue<int[]> q = new LinkedList<>();
+
+    static int[] dx = {-1, 1, 0, 0, 0, 0};
+    static int[] dy = {0, 0, -1, 1, 0, 0};
+    static int[] dz = {0, 0, 0, 0, -1, 1};
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        m = Integer.parseInt(st.nextToken());
+        n = Integer.parseInt(st.nextToken());
+        h = Integer.parseInt(st.nextToken());
+
+        box = new int[h][n][m];
+
+        int remain = 0;
+
+        for (int z = 0; z < h; z++) {
+            for (int x = 0; x < n; x++) {
+                st = new StringTokenizer(br.readLine());
+                for (int y = 0; y < m; y++) {
+                    int v = Integer.parseInt(st.nextToken());
+                    box[z][x][y] = v;
+
+                    if (v == 1) q.offer(new int[]{z, x, y});
+                    else if (v == 0) remain++;
+                }
+            }
+        }
+
+        if (remain == 0) {
+            System.out.println(0);
+            return;
+        }
+
+        int day = 0;
+
+        while (!q.isEmpty()) {
+            int size = q.size();
+            for (int i = 0; i < size; i++) {
+                int[] cur = q.poll();
+                int cz = cur[0], cx = cur[1], cy = cur[2];
+
+                for (int dir = 0; dir < 6; dir++) {
+                    int nz = cz + dz[dir];
+                    int nx = cx + dx[dir];
+                    int ny = cy + dy[dir];
+
+                    if (!isOk(nz, nx, ny)) continue;
+                    if (box[nz][nx][ny] != 0) continue;
+
+                    box[nz][nx][ny] = 1;
+                    remain--;
+                    q.offer(new int[]{nz, nx, ny});
+                }
+            }
+
+            day++;
+
+            if (remain == 0) {
+                System.out.println(day);
+                return;
+            }
+        }
+
+        System.out.println(-1);
+    }
+
+    static boolean isOk(int z, int x, int y) {
+        return !(z < 0 || z >= h || x < 0 || x >= n || y < 0 || y >= m);
+    }
+}
+
+```