From Lezhin:

High school senior Min-kyum has been left to his own defenses after his parents kicked him out of their lives. His new house is in a shabby neighborhood, the site of several mysterious assaults that have left victims with bite marks on their necks and blood loss symptoms. After moving in, Min-kyum heads out for a meal…then somehow wakes up at home with strange marks on his neck. He tries to shrug it off, but his deskmate at the new school looks suspiciously pale and familiar…

Original Webcomic:
Foxtoon, Ridibooks
Official English Translation (Lezhin)
Official English Translation (Webnovel)
Official Chinese Translation
Official Japanese Translation