Millennial Mage - Chapter 515: The Thief of Joy

Victor was a normal 21-year-old man, he grew up in a loving family that helped him take care of himself knowing that he had a practically incurable disease, the RH null blood, he was the owner of a rare blood type…

But what Victor didn’t know, is that this blood type was a delicacy in the supernatural world, creatures that fed on blood loved his blood type…

And that blood he hated would be the factor that would make Victor the greatest vampire of all time.

Being given a chance and reincarnated is nice and all, yet why do I have to become that male friend who just watches the protagonist flirting with his harem?---World: Kaguya-sama: Love Is War - Hyouka ----

In the eyes of outsiders, Yan Ruxu’s conditions are extremely good: good looks, high education, a high salary, and a high position, but there is a fatal flaw: she is divorced, with a three-year-old child. Yan Ruxu didn’t care what others thought of her, she just wanted to raise her son well and live her own life.

- Description from Novelupdates

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.