[Key/New Features]
- Offers freehand drawing annotation capabilities.
- Synchronize and use annotations like notes, highlighters, and bookmarks across different devices.
- Supports multimedia content such as audio and video for self-study, including problem-solving activities.

[Usage Guide]
- Additional data charges may apply when connected via wireless data networks (3G/LTE, etc.).
- You can use the service after signing up on the ReaderRoy or HangulRoy websites.
- eBooks are not provided as separate files and can only be accessed through the provided viewer.

[Contact for Inquiries]
- For inquiries related to eBook purchases (cancellations, refunds, etc.): 070-4890-9805
- For inquiries related to the eBook system (system errors, etc.): 070-4890-9805