After breaking up, I picked up a beautiful vampire girl

Many years later, someone from the Western Church pointed a cross at Li Muhan and said, "He, he has a demon inside him!"
“You are mistaken.”
Li Muhan smiled slightly, "There is more than one."
"Yes, there are more than just demons."
………………
At the age of 21, Li Muhan, who was penniless and abandoned by his childhood sweetheart, could never have imagined that the beautiful girl he took in when he gave up on himself would land him in jail a month later.
"Name"
"Li Muhan."
"Belonging to the alien species"
"demon"
"Okay, let's go over there and measure the disaster level."
…………
"Uh...Xia Yue, what is the relationship between vampires and demons?"
"not so good."
"........."
"But you and I...will always be together."