King of Envy(By Ana Hyang)

Before the releasing of the book... There was a lot of hype and the whole series(king of sins) somewhat pretty good.. The point of trying to make here is ... Is it worth to read the book I mean I have like already completed reading all 4 of the series so. . before reading the 5th one.. I wanna know how's the book .. That's why spoil it for me...at least a review would work too