The cast did a great job but the story was handicapped from the very beginning. No amount of effort in the writing department would save it if the basis were this fragile. The most crucial part was to show how deep their love was but they failed to establish that, not even remotely close. This led to make all the subsequent events lukewarm and impractical. They didn't even dare to show a single kiss. The drama is padded with sad scenes to make us forget that fact and be drenched in the sadness instead.
I hated the ending. There was only one possible, reasonable and appropriate ending that is for both of them to die but the writer didn't allow that.