Looking for a lost BL

Aaaahhh, I accidentally closed all my tabs and lost the mangas I was reading, but I was really in love with this one, Idk the title but it was a Vamipire universe where they were called 'biters' and the bottom had brown hair and was investigation a case where a young woman had died due to a mysterious bite. His childhood friend, the top and also a bitter himself unbeknown to the bottom, told him to stop investigating. He doesnt, he gets attacked, his friend saves him, the bottom discovers the top is a vampire, and then they have sex. Hopefully that's enough info for someone to recognize it. Thanks in advance!