■ Only available in North Io! Select a reading mode when opening the viewer.
- Depending on your reading purpose, you can select the desired mode between ‘Reading Alone’ and ‘Reading Together’.
- In ‘Read Alone’ mode, you can read a book quietly alone while concentrating on the text.
- In ‘Read Together’ mode, you can share your reading records with group members in real time.

■ Read the reading records and ‘comments’ of experts and influencers along with the book.
- Commentaries purchased from the Bookio site can be viewed by activating them in ‘Read Alone’ mode.
- If you purchase multiple commentaries for one book, you can select and read the commentary you want one at a time.

■ You can read books while sharing each other's reading records.
- In ‘Read Together’ mode, you can share highlights and notes with group members in the group you have joined.
- You can also collect the sentences highlighted by the most people or only the highlighted sentences of specific people.
- You can recommend notes you like or copy them in ‘read alone’ mode.

■ Read with people you want.
- ‘Reading Together’ is done in groups.
- You can browse the group list and join the group you want or create your own group.
- When creating a group, you can set whether the group is public (public/private), the number of people in the group, etc.

■ Manage your groups.
- In the ‘My Groups’ menu, you can check the list of groups you have created and the groups you have joined and manage the groups.
- If you are the group leader or a group member, you can invite any member you want to the group.
- If you are the group leader, you can ‘export’ or cancel ‘export’ specific group members.

■ You can take notes on any device that supports a pen.
- You can take notes when viewing PDF books on devices that support a pen.
- Provides various writing options such as color / thickness / transparency.
- You can back up and restore your handwriting records through the app settings menu.

[App access permission information]

■ Required access rights
-Storage space: Required for storing handwriting data.

■ Select access rights
-Camera, photo: Required for registering a user profile photo.

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■ Customer Center: https://buk.io/help/main