diff --git "a/mj010504/Programmers/\354\230\244\355\224\210\354\261\204\355\214\205\353\260\251.cpp" "b/mj010504/Programmers/\354\230\244\355\224\210\354\261\204\355\214\205\353\260\251.cpp"
new file mode 100644
index 0000000..408ac58
--- /dev/null
+++ "b/mj010504/Programmers/\354\230\244\355\224\210\354\261\204\355\214\205\353\260\251.cpp"
@@ -0,0 +1,61 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+struct chat {
+    char c;
+    string id, name;
+};
+
+map<string, string> mp; // id, name
+
+chat toChat(string input) {
+    vector<string> sv; string temp;
+    stringstream ss(input);
+
+    while(getline(ss, temp, ' ')) {
+        sv.push_back(temp);
+    }
+
+    if(sv.size() == 2) {
+        return {'l', sv[1], mp[sv[1]]};
+    }
+
+    if(sv.size() == 3) {
+        mp[sv[1]] = sv[2];
+
+        if(sv[0] == "Enter") return {'e', sv[1], sv[2]};
+        else{ // change
+             return {'c', sv[1], sv[2]};
+        }
+    }
+}
+
+string toKoreanChat(chat ct) {
+    string temp = "";
+    string name = mp[ct.id];
+    if(ct.c == 'l') {
+        temp = name + "님이 나갔습니다.";
+    }
+
+    if(ct.c == 'e') {
+        temp = name + "님이 들어왔습니다.";
+    }
+
+    return temp;
+}
+
+vector<string> solution(vector<string> rv) {
+    vector<string> res;
+    vector<chat> chats;
+    for(int i = 0; i < rv.size(); i++) {
+        auto ct = toChat(rv[i]);
+        if(ct.c != 'c') chats.push_back(toChat(rv[i]));
+    }
+
+    for(auto ct : chats) {
+        res.push_back(toKoreanChat(ct));
+    }
+
+    return res;
+}