diff --git a/README.md b/README.md
index edcf42a..e6d0ca5 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,2 @@
 # Introduction to Network Programming Homework
 
-## TODO
-
-- Connection
-    - Scan port
diff --git a/handlers/wordle/postGuess.go b/handlers/wordle/postGuess.go
index 263b840..b275921 100644
--- a/handlers/wordle/postGuess.go
+++ b/handlers/wordle/postGuess.go
@@ -1,6 +1,7 @@
 package wordle
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -8,12 +9,11 @@ import (
 	"gitea.konchin.com/ytshih/inp2025/middlewares"
 	"gitea.konchin.com/ytshih/inp2025/utils"
 	"github.com/uptrace/bunrouter"
-	"github.com/vmihailenco/msgpack/v5"
 	"go.uber.org/zap"
 )
 
 type PostGuessInput struct {
-	Guess string `msgpack:"guess"`
+	Guess string `json:"guess"`
 }
 
 func (self *Handlers) PostGuess(
@@ -31,7 +31,7 @@ func (self *Handlers) PostGuess(
 	}
 
 	var input PostGuessInput
-	if err := msgpack.Unmarshal(b, &input); err != nil {
+	if err := json.Unmarshal(b, &input); err != nil {
 		return middlewares.HTTPError{
 			StatusCode:  http.StatusBadRequest,
 			Message:     "failed to unmarshal from msgpack",
@@ -39,9 +39,6 @@ func (self *Handlers) PostGuess(
 		}
 	}
 
-	zap.L().Info("input",
-		zap.String("input", fmt.Sprintf("%+v", input)))
-
 	username, _, ok := req.BasicAuth()
 	if !ok {
 		return middlewares.HTTPError{
@@ -50,6 +47,10 @@ func (self *Handlers) PostGuess(
 		}
 	}
 
+	zap.L().Info("input",
+		zap.String("input", fmt.Sprintf("%+v", input)),
+		zap.String("username", username))
+
 	self.opCh <- &OperationGuess{
 		Username: username,
 		Guess:    input.Guess,
diff --git a/stages/wordle.go b/stages/wordle.go
index 62d9250..b5aeb5d 100644
--- a/stages/wordle.go
+++ b/stages/wordle.go
@@ -86,14 +86,10 @@ func (m *WordleClientModel) getState() tea.Cmd {
 
 func (m *WordleClientModel) postGuess(guess string) tea.Cmd {
 	return func() tea.Msg {
-		b, err := msgpack.Marshal(wordle.PostGuessInput{
-			Guess: guess,
-		})
-		if err != nil {
-			m.err = fmt.Errorf("failed to post guess, %w", err)
-		}
-		_, err = m.client.R().
-			SetBody(b).
+		_, err := m.client.R().
+			SetBody(wordle.PostGuessInput{
+				Guess: guess,
+			}).
 			Post("/api/guess")
 		if err != nil {
 			m.err = fmt.Errorf("failed to post guess, %w", err)