diff --git a/Devil_C/week04_dfs/sanghun/BOJ_2606.c b/Devil_C/week04_dfs/sanghun/BOJ_2606.c
new file mode 100644
index 0000000..754525d
--- /dev/null
+++ b/Devil_C/week04_dfs/sanghun/BOJ_2606.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct virus{
+    int node;
+    struct virus* next;
+};
+
+struct virus* graph[101];
+
+void network(int u, int v){
+    struct virus *vir;
+    vir = (struct virus*)malloc(sizeof(struct virus));
+    vir -> node = v;
+    vir -> next = graph[u];
+    graph[u] = vir;
+}
+
+int visited[101];
+int count = 0;
+void dfs(int start){
+    visited[start] = 1;
+    count ++;
+    struct virus* current = graph[start];
+    while(current != NULL){
+        if(!visited[current -> node]){
+            dfs(current -> node);
+        }
+        current = current -> next;
+    }
+    return;
+}
+
+int main(){
+    int com;
+    int num;
+    scanf("%d %d", &com, &num);
+    
+    for(int i=0; i<num; i++){
+        int u, v;
+        scanf("%d %d", &u, &v);
+        network(u, v);
+        network(v, u);
+    }
+
+    dfs(1);
+    printf("%d", count -1);
+    return 0;
+}
\ No newline at end of file
diff --git a/Devil_C/week04_dfs/sanghun/filename.c b/Devil_C/week04_dfs/sanghun/filename.c
deleted file mode 100644
index e69de29..0000000