This document provides an overview of LINE Login and its roadmap. LINE Login allows users to log into third-party services using their LINE account without needing separate logins. It uses OAuth 2.0 for web login and native SDKs for app-to-app authentication on mobile. Major features in development include auto-login, integrating user profiles and LINE Pay into services, and adding new APIs to access social information and make payments. The goal is to improve user experience by seamlessly connecting LINE accounts across services.