Omg since people are allowed to have opinions, I'll have one as well. Y'all are used to the same happy ever after endings. Not every drama needs to have the perfect ending. This was about time traveling, so ofc it would change the future. Everything was so perfectly done by the actors, and they didn't need to kiss to make their relationship romantic. Stop complaining about every little thing, and look at it from a different view. To sacrifice the shared memories with someone just because you wanted them to live happily and not in pain for years and years is something so beautiful. They gave them what they never had. A happy ending.
I wish this was at least 24 episodes...I haven't watched such a great drama in a long time, and probably won't after this masterpiece π from their acting to script, everything was so perfect π«