diff --git a/kangrae-jo/README.md b/kangrae-jo/README.md
index 3fd6751..735c043 100644
--- a/kangrae-jo/README.md
+++ b/kangrae-jo/README.md
@@ -16,5 +16,6 @@
 | 12차시 | 2024.12.24 |  HEAP  | [크리스마스 선물](https://www.acmicpc.net/problem/14235)|[#44](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/44)|
 | 13차시 | 2024.12.28 |  Graph  | [줄 세우기](https://www.acmicpc.net/problem/2252)|[#46](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/46)|
 | 14차시 | 2024.12.31 |  Two Pointer  | [두 용액](https://www.acmicpc.net/problem/2470)|[#48](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/48)|
+| 15차시 | 2024.01. |  구현  | [동영상 재생기](https://school.programmers.co.kr/learn/courses/30/lessons/340213?language=cpp)|[#57](https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/57)|
 
 ---
diff --git "a/kangrae-jo/\352\265\254\355\230\204/15-kangrae-jo.cpp" "b/kangrae-jo/\352\265\254\355\230\204/15-kangrae-jo.cpp"
new file mode 100644
index 0000000..6d2c27c
--- /dev/null
+++ "b/kangrae-jo/\352\265\254\355\230\204/15-kangrae-jo.cpp"
@@ -0,0 +1,69 @@
+#include <string>
+#include <vector>
+
+using namespace std;
+
+struct Time {
+    int m, s;
+};
+
+string solution(string video_len, string pos, string op_start, string op_end, vector<string> commands) {
+    Time video_len_, pos_, op_start_, op_end_;
+
+    // string to int (time)
+    video_len_.m = (video_len[0] - '0') * 10 + (video_len[1] - '0');
+    video_len_.s = (video_len[3] - '0') * 10 + (video_len[4] - '0');
+    pos_.m = (pos[0] - '0') * 10 + (pos[1] - '0');
+    pos_.s = (pos[3] - '0') * 10 + (pos[4] - '0');
+    op_start_.m = (op_start[0] - '0') * 10 + (op_start[1] - '0');
+    op_start_.s = (op_start[3] - '0') * 10 + (op_start[4] - '0');
+    op_end_.m = (op_end[0] - '0') * 10 + (op_end[1] - '0');
+    op_end_.s = (op_end[3] - '0') * 10 + (op_end[4] - '0');
+
+    // 오프닝 건너뛰기
+    if (op_start_.m * 60 + op_start_.s <= pos_.m * 60 + pos_.s &&
+        op_end_.m * 60 + op_end_.s > pos_.m * 60 + pos_.s) {
+        pos_.m = op_end_.m;
+        pos_.s = op_end_.s;
+    }
+
+    // command 실행
+    for (string command : commands) {
+        if (command == "next") {
+            pos_.s += 10;
+            if (pos_.s >= 60) {
+                pos_.s -= 60;
+                pos_.m += 1;
+            }
+            if (video_len_.m * 60 + video_len_.s <= pos_.m * 60 + pos_.s) {
+                pos_.m = video_len_.m;
+                pos_.s = video_len_.s;
+            }
+        } 
+        else if (command == "prev") {
+            pos_.s -= 10;
+            if (pos_.s < 0) {
+                pos_.s += 60;
+                pos_.m -= 1;
+            }
+            if (pos_.m < 0) {
+                pos_.m = 0;
+                pos_.s = 0;
+            }
+        }
+        // 오프닝 건너뛰기
+        if (op_start_.m * 60 + op_start_.s <= pos_.m * 60 + pos_.s &&
+            op_end_.m * 60 + op_end_.s > pos_.m * 60 + pos_.s) {
+            pos_.m = op_end_.m;
+            pos_.s = op_end_.s;
+        }
+    }
+
+    string answer = "";
+    if (pos_.m < 10) answer += "0";
+    answer += to_string(pos_.m) + ":";
+    if (pos_.s < 10) answer += "0";
+    answer += to_string(pos_.s);
+
+    return answer;
+}
\ No newline at end of file