Why? You dont like bad endings?
SPOILER:
so I looked into the spoilers after seeing that other comment. And the commentator was kinda right but also failed to mention a bunch of other stuff. The ending is technically not a sad ending, as Charlotte and Dietrich do end up together, it's just an open ending since you don't know wether or not he still has his memories. And yes Noah does end up disappearing, but after he disappears and charlotte leaves the mansion she becomes pregnant with another child, and while this could very much not be noah, because of other circumstances she would like to imagine it's him.
thanks for the spoilers, i know what’s gonna happen and it saved me from continuing the story.