Use APKPure App
Get 책 읽어주는 [보이스북] old version APK for Android
To read the book with voice applications
It is an app that reads the Hangul .txt file by voice.
Put the * .txt file in the download folder.
On some phones, the file is not displayed in the file selection menu.
(Phone-Settings-App Management-Voice-Books-App Permissions-Storage-Activation)
Please note that the app authority search method varies depending on the phone model.