Dramas with bad endings

I think it makes sense to go through MDL and once and for all put the dramas with bad endings in a row. So, maybe if people see this list they might be saved the despair/confusion these endings brought. - This list includes endings of the following type: terrible/ open-ended (they could/should do so much more with it) / confusing/ inconclusive etc. The dramas following are added based on their endings solely - they're probably still great dramas but you should not expect to be a particularly happy viewer after seeing what they did with the ending. They're in no particular order (though the first one falls under the category - terrible , the rest did well overall as a drama, the ending just fell short)