Whether the ending is sad or satisfying is up to you. After all, everyone has a Hamlet. It's not a horror movie, but it does have a bit of violence at the beginning.
Because of an accidental encounter, He Qiu, a vampire who strayed into the world of the depressed girl Jiang Luo, stopped hunting and no longer wasted his eternity in drunkenness and wealth. The girl also gradually opened her heart and let the sunshine enter her world again. Jiang Luo's short life could not accompany him through the next thousand years, but waiting for the next rebirth of the girl's soul was the warmest sunshine in his heart.
"This is the real farewell. I don't know if we can see each other again in the future."
"I'll wait for you."
Intention: Get out of the darkness