So from what I understand park H did not like that Claude killed himself because of Ambrosia power curse so she went back in time as Sarah Millen and created a timeline where Claude doesn't exist and kept her powers a secret and married Ethan hoping her love was enough to stop the Ambrosia power curse which it was not cause her student still used his powers for evil and made Ethan loose control which Sarah gave her life to still be with Ethan and Park H realized she was truly alone but Sarah's magic came back to her and so Park H used that magic one last time to save both Claude and Ethan and bury her love and be honest with her powers to both of them. So Park H gor herself mortally injured to be able to fix the time line which lead us to where Sara returned to her body in the present with all the memories of what happened. Your not stupid its alot to follow and im not wven sure im translating this correctly this is all hypothesis.
I'm too stupid to understand what on earth just happened.