UniSnow's Manga

Jaehyun may be the composed upperclassman on campus, but he secretly plays the hottest elven diva online with a love of pricey costumes. He meets Eunsung, a handsome first-year with deep pockets guarding his own secrets, at a school event. They connect instantly, but what begins as a sweet challenge becomes a risky game of affection on- and offline!Official English Translation on TappyToon

Park Min Gyeom is a human with a disease called hemochromatosis — his blood absorbs too much iron, so he has to donate it regularly to stay healthy. Kim Chun Sam is a half-vampire who needs blood to live. So begins an unusual symbiotic relationship between "predator" and "prey."