My wife is horrible

What should I do if the girl who likes me is not a human?
Waiting online, very urgent...
As an ordinary high school student, no one cares about him, he has never talked to girls, goes to school and goes home on time every day, never participates in extracurricular activities, and is an extremely mediocre high school student.
After reincarnation and experiencing all kinds of dangers in the world, Su Wu plans to live a life of lying down in the future...
He used the knowledge from his previous life to make a small amount of money, but he didn’t marry, buy a house, or have children… and finally died alone in a rented house…
He thought so, but sometimes things don't go as planned...
When he saw the living corpse that had been chopped up, placed in a small coffin, immersed in black water, and growing strange flowers...
He was startled awake...
He thought it was a dream, but a few days later, he was pulled into the scene in the dream...
That was not a dream, but a real place...
And the corpse in the coffin cage... is also real...
"You have awakened the young lady. The marriage contract has been established. You are the candidate for the ghost marriage. Please go and meet the young lady..." The old man, whose face was half melted, revealing the white bones under the flesh and blood, smiled respectfully at Su Wu, but he looked extremely hideous...
"Can I refuse?" Su Wu trembled...
"cannot…"