diff --git a/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java b/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java
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+++ b/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java
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+/**
+ * The MIT License (MIT)
+ * <p>
+ * Copyright @ 2024, Shohei Yamagiwa
+ * </p>
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the “Software”), to deal
+ * in the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ * <p>
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * </p>
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.example.jerseyexercise.resources;
+
+import jakarta.ws.rs.*;
+import org.springframework.http.MediaType;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * {@link SYamagiwa} represents my account resource
+ *
+ * @author Shohei Yamagiwa
+ * @since 1.0
+ */
+@Path("/s-yamagiwa")
+public class SYamagiwa {
+    /**
+     * First name of the account.
+     */
+    private String firstName = "Shohei";
+
+    /**
+     * Last name of the account.
+     */
+    private String lastName = "Yamagiwa";
+
+    /**
+     * All posts of the account
+     */
+    private final List<String> posts = new ArrayList<>();
+
+    /**
+     * Returns the full-name of the account.
+     *
+     * @return The name of the account
+     * @since 1.0
+     */
+    @GET()
+    @Path("/name")
+    public String getFullName() {
+        return firstName + " " + lastName;
+    }
+
+    /**
+     * Returns the first-name of the account.
+     *
+     * @return The first name of the account
+     * @since 1.0
+     */
+    @GET()
+    @Path("/first-name")
+    public String getFirstName() {
+        return firstName;
+    }
+
+    /**
+     * Returns the last-name of the account.
+     *
+     * @return The last name of the account
+     * @since 1.0
+     */
+    @GET()
+    @Path("/last-name")
+    public String getLastName() {
+        return lastName;
+    }
+
+    @PUT
+    @Path("/firstName")
+    public void setFirstName(@FormParam("firstName") String firstName) {
+        this.firstName = firstName;
+    }
+
+    @PUT
+    @Path("/lastName")
+    public void setLastName(@FormParam("lastName") String lastName) {
+        this.lastName = lastName;
+    }
+
+    /**
+     * Returns all posts of the account.
+     *
+     * @return All posts of the account.
+     */
+    @GET
+    @Path("/posts")
+    @Produces(MediaType.APPLICATION_JSON_VALUE)
+    public List<String> getPosts() {
+        return posts;
+    }
+
+    /**
+     * Add new post of the account.
+     */
+    @POST
+    @Path("/posts")
+    public void addPost(@FormParam("content") String tweet) {
+        posts.add(tweet);
+    }
+
+    /**
+     * Get the post of the account with given id.
+     *
+     * @return Specified post of the account.
+     */
+    @GET
+    @Path("/posts/{id}")
+    @Produces(MediaType.TEXT_PLAIN_VALUE)
+    public String getPost(@PathParam("id") int id) {
+        if (id >= posts.size()) {
+            return "The requested resource does not exist on the server!";
+        }
+        return posts.get(id);
+    }
+}