worst endings you’ve seen in a drama?

i’m usually satisfied with the endings of really everything i watch, but i recently just watched Pretty Boy and the ending was so infuriatingly, mind numbingly stupid that i was shaking afterwards, it was so close to the perfect happy ending but it decided to throw everything away in the last few minutes, so im curious what the worst, most infuriating, dumbest endings are that you’ve seen in a drama

if you haven’t seen it and your curious about the ending >!the Mls forced to take the throne and be all alone in the palace while the Fl leaves him and goes on a family vacation with the the Mls sister figure and her dad, who might i add MASSACRED THE FL’S ENTIRE CLAN!!! and she just doesn’t care?!?! and even after finding out what happened the sister figure was still protecting her dad? like if the Fl poked him with a needle she would scream at the Fl for being “cruel and heartless” like girl?? he literally massacred her entire clan?? with his hands?? and she’s the cruel one?? also none of the side couples got together either for some stupid reason!<