diff --git a/Munbin-Lee/README.md b/Munbin-Lee/README.md
index 1be0e769..5221cadf 100644
--- a/Munbin-Lee/README.md
+++ b/Munbin-Lee/README.md
@@ -38,5 +38,6 @@
 | 35차시 | 2024.02.18 |  백트래킹  | <a href="https://www.acmicpc.net/problem/24891">단어 마방진</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/140 |
 | 36차시 | 2024.02.21 |  문자열  | <a href="https://www.acmicpc.net/problem/15927">회문은 회문아니야!!</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/143 |
 | 37차시 | 2024.03.05 |  백트래킹  | <a href="https://school.programmers.co.kr/learn/courses/30/lessons/250136">석유 시추</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/150 |
-| 37차시 | 2024.03.08 |  트라이  | <a href="https://www.acmicpc.net/problem/5052">전화번호 목록</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/155 |
+| 38차시 | 2024.03.08 |  트라이  | <a href="https://www.acmicpc.net/problem/5052">전화번호 목록</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/155 |
+| 39차시 | 2024.03.14 |  문자열  | <a href="https://www.acmicpc.net/problem/1050">물약</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/160 |
 ---
diff --git "a/Munbin-Lee/\353\254\270\354\236\220\354\227\264/39-\353\254\274\354\225\275.py" "b/Munbin-Lee/\353\254\270\354\236\220\354\227\264/39-\353\254\274\354\225\275.py"
new file mode 100644
index 00000000..efcfe576
--- /dev/null
+++ "b/Munbin-Lee/\353\254\270\354\236\220\354\227\264/39-\353\254\274\354\225\275.py"
@@ -0,0 +1,45 @@
+stdin = open(0)
+
+def input():
+    return stdin.readline().rstrip()
+
+N, M = map(int, input().split())
+
+prices = {}
+
+for _ in range(N):
+    item, price = input().split()
+    prices[item] = int(price)
+
+recipes = []
+
+for _ in range(M):
+    target, formula = input().split('=')
+    terms = formula.split('+')
+    recipes.append([target, terms])
+
+def updatePrice(target, terms):
+    price = 0
+    
+    for term in terms:
+        count = int(term[0])
+        item = term[1:]
+        
+        if item not in prices:
+            return
+        
+        price += count * prices[item]
+    
+    if target not in prices or prices[target] > price:
+        prices[target] = price
+
+for _ in range(M):
+    for recipe in recipes:
+        updatePrice(recipe[0], recipe[1])
+
+if 'LOVE' not in prices:
+    print('-1')
+    exit()
+
+answer = min(prices['LOVE'], 1000000001)
+print(answer)