Was this a horror series?

It is written that someone who enjoys inflicting pain on others is called sadist.
That’s how I would call this writer. Could not sleep at night after that horror ending. I wish there was more written about the ending somewhere on internet so to know, whether to watching it.
If this was a true story, I would not say anything.
But who would write this type of story? My conclusion is, that only person, who enjoys watching other hurt...That’s what the writer actually wanted; to hurt the audience...These type of series should by band.