◾️ this comment out(user login check) line is effective, so delete it completely.
<!– {% if target_project.writer == user %} –>
{% extends 'base.html' %}
{% block content %}
    <div class="project-detail">
        <h1>{{ target_project.title }}</h1>
        <h3>{{ target_project.writer.profile.nickname }}</h3>
        <img src="{{ target_project.image.url }}" alt="">
        <p>{{ target_project.desc }}</p>
        <!-- {% if target_project.writer == user %} -->
        {% include 'snippets/related_list.html' with article_list=object_list %}
        <!-- {% endif %} -->
        <hr>
    </div>
{% endblock %}