diff --git a/go.mod b/go.mod
index 036a3ac..23a6a5e 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,9 @@ module git.araozu.dev/card-jong-be
 go 1.22.2
 
 require (
-	github.com/gorilla/mux v1.8.1 // indirect
-	github.com/rs/cors v1.11.0 // indirect
+	github.com/gorilla/mux v1.8.1
+	github.com/nrednav/cuid2 v1.0.0
+	github.com/rs/cors v1.11.0
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
 )
diff --git a/go.sum b/go.sum
index cb2e461..f8fb465 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,10 @@
 github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
 github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
+github.com/nrednav/cuid2 v1.0.0 h1:27dn1oGiG+23Wa8XJ2DHeMoMa18Zs9u1+UHI9IlcGKM=
+github.com/nrednav/cuid2 v1.0.0/go.mod h1:pdRH5Zrjwnv8DZ74XvHR3jX+bzJNfQjwLQ3JgSI2EmI=
 github.com/rs/cors v1.11.0 h1:0B9GE/r9Bc2UxRMMtymBkHTenPkHDv0CW4Y98GBY+po=
 github.com/rs/cors v1.11.0/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
+golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/main.go b/main.go
index 074dcdd..20d34b3 100644
--- a/main.go
+++ b/main.go
@@ -1,19 +1,31 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
 	"os"
 
 	"github.com/gorilla/mux"
+	"github.com/nrednav/cuid2"
 	"github.com/rs/cors"
 )
 
+type PersonInfo struct {
+	UserId   string
+	Username string
+}
+
+var users map[string]string
+
 func main() {
 	fmt.Println("hello SEKAI!!")
 	router := mux.NewRouter().PathPrefix("/api").Subrouter()
 
+	// initialize the global users map
+	users = make(map[string]string)
+
 	router.HandleFunc("/register", Register)
 
 	port, ok := os.LookupEnv("PORT")
@@ -33,13 +45,31 @@ func main() {
 	log.Fatal(http.ListenAndServe(":"+port, handler))
 }
 
-type PersonInfo struct {
-	useruuid int
-	username string
-}
-
 func Register(writer http.ResponseWriter, request *http.Request) {
+	username := "ga"
+
+	uid := cuid2.Generate()
+
+	// Store in the users map
+	users[uid] = username
+
+	// The result json
+	result := PersonInfo{
+		UserId:   uid,
+		Username: username,
+	}
+
 	writer.Header().Set("Content-Type", "application/json")
+
+	jsonData, err := json.Marshal(result)
+	if err != nil {
+		fmt.Printf("Error in JSON marshal: %s\n", err)
+		writer.WriteHeader(http.StatusInternalServerError)
+		fmt.Printf("{\"error\": \"%s\"}", err)
+		return
+	}
+
 	writer.WriteHeader(http.StatusOK)
-	fmt.Fprintf(writer, "{\"yes\":\"and\"}")
+
+	fmt.Fprintf(writer, "%s", jsonData)
 }