I Got Married from the Start, but My Bride Is a Female Ghost

In the lands of Great Qian, demons and monsters run rampant, and evil spirits lurk everywhere.

If mortals wish to cultivate, they must slaughter their own kind and use them as sustenance to ascend the Great Dao. When they merge with the Dao, they transform into demons and monsters and ascend to immortality.

While playing Black Myth, Zhao Yu dies suddenly and transmigrates into another world. He awakens a mysterious third eye that can see through demons' true forms and perceive all manner of illusions. On his wedding day, he uses it to slay an evil spirit and obtain the Undying Scripture.

[Undying: An ability unique to the Undying Scripture. Any death that is not caused by Dao transformation or by the person in question will result in rebirth, at the cost of losing nine-tenths of one's cultivation, never less than fifty years' worth.]

Many years later...

"Which of us is truly undying, me or you?"