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[Major/New Services]

- Provides a freehand drawing annotation function.
- Annotations such as notes, highlighters, and bookmarks can be synchronized and used on other devices.
- Self-study is possible through the use of multimedia content such as audio and video and problem solving.

[Information Use]

- Separate data usage fees may apply when connecting to a wireless data communication network (3G/LTE, etc.).
- You can use it after registering as a member on the Leader Roy or Hangeul Roy homepage.
- The eBook is not provided as a separate file and can only be used through the provided viewer.

[Use inquiry]

- Inquiries regarding eBook purchase (cancellation, refund, etc.): 070-4890-9805
- Inquiries regarding the eBook system (system errors, etc.): 070-4890-9805