When the sword mercilessly penetrated her heart, she gave up her life just to fulfill his wish.
How she wished she could hear him call her "Sister Yu" again, because that year was when he loved her the most, but unfortunately she forgot and knew it too late.
When opportunity brought her back to the origin of the two of them, she forgot everything and him again.
Intention: Only by facing the pain can we completely get rid of the past.