Worst ending ever imagined

Literally when the trailer released I thought this season would bring smile of sun ohh face again' but instead of that it made him sad ever more, I still don't know why she did such cruel thing with him, she was the most self centred charecter in whole series, I'm not blaming the actress but I'm blaming the story writer because this wasn't the expected ending of the show idk why he wrote bad to sun ohh specially cozz everyone at the end got what they wanted except sun ohh, after watching this I'm even more sad