I used this book to review basic Korean concepts and that is why it didn't take me too long to finish it. Basically, I was doing a chapter a day. The book is really well organized and the lessons are arranged in bite-size portions with exercises at each section and a full review of concepts at the end of the chapter.
It is not scary to the beginner and has a good explanation of hangeul and pronunciation rules. The grammar is given in bite-sized chunks in a very logical manner. Each chapter builds on the one before it.
The book has 5 chapters, an answer key to the exercises, a script of the listening portions, and a Korean explanation of the grammar concepts at the end.
I highly recommend this book for beginners who want an easy book to start their learning journey.