Yeah the series ended at vol. 4. From what I gather it was because of the ratings the novel was branded with which was a r-18 or something like that status because a snitched decided to informed a moral committee of what they found offense in the light novel which made it the first korea light novel to achieve that status. Maybe the publishers felt that it was risky to keep running a series like that and told the author to finish it as soon as possible.
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