diff --git a/tgyuuAn/BFS/Rain (Small).py b/tgyuuAn/BFS/Rain (Small).py
new file mode 100644
index 00000000..0e02ba03
--- /dev/null
+++ b/tgyuuAn/BFS/Rain (Small).py	
@@ -0,0 +1,53 @@
+from collections import deque
+import sys
+
+def input(): return sys.stdin.readline().rstrip()
+
+dx = [0, 0, -1, 1]
+dy = [-1, 1, 0, 0]
+
+T = int(input())
+
+for test_idx in range(T):
+    row, col = map(int, input().split())
+    board = [list(map(int,input().split())) for _ in range(row)]
+    new_board = [[0 for _ in range(col)] for _ in range(row)]
+
+    for height in range(1, 1001):
+        for start_row in range(row):
+            for start_col in range(col):
+                if board[start_row][start_col] >= height: continue
+                
+                deq = deque()
+                deq.append((start_row, start_col))
+                history = {(start_row, start_col),}
+                
+                visited = set()
+                visited.add((start_row, start_col))
+                
+                while deq:
+                    now_row, now_col = deq.popleft()
+                    
+                    # 가장자리에 물이 흘렀다는 것이므로 break
+                    if now_row in (0, row-1): break
+                    if now_col in (0, col-1): break
+
+                    for dir in range(4):
+                        new_row = now_row + dy[dir]
+                        new_col = now_col + dx[dir]
+
+                        if new_row < 0 or new_row >= row: continue
+                        if new_col < 0 or new_col >= col: continue
+                        if (new_row, new_col) in visited: continue
+                        if board[new_row][new_col] >= height: continue
+                    
+                        deq.append((new_row, new_col))
+                        history.add((new_row, new_col))
+                        visited.add((new_row, new_col))
+                    
+                    # 가장자리에 물이 흐르지 않아 break되지 않았으면,
+                else:
+                    for history_row, history_col in history:
+                        new_board[history_row][history_col] = height - board[history_row][history_col]
+
+    print(f"Case #{test_idx+1}: {sum([sum(row) for row in new_board])}")
\ No newline at end of file
diff --git a/tgyuuAn/README.md b/tgyuuAn/README.md
index aea5b0d5..fca0adc4 100644
--- a/tgyuuAn/README.md
+++ b/tgyuuAn/README.md
@@ -79,4 +79,5 @@
 | 70차시 | 2024.08.16 |  스택  | <a href="https://www.acmicpc.net/problem/22866">탑 보기</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/232
 | 71차시 | 2024.08.20 |  다익스트라  | <a href="https://www.acmicpc.net/problem/24042">다익스트라</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/235
 | 72차시 | 2024.08.23 |  DFS + 트리  | <a href="https://www.acmicpc.net/problem/20188">등산 마니아</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/238
+| 73차시 | 2024.08.26 |  BFS  | <a href="https://www.acmicpc.net/problem/14324">Rain (Small)</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/239
 ---