Trying to find a bl manga

Ever since all the listings been wiped out earlier this year I’ve been trying to find this omegaverse bl manga that’s about a beta pretending to be an omega. I might be mixing this up but I believe the ml is alpha and a cop trying to solve a case of a serial killer who targets omegas. And if I remember right, the mc pretends to be an omega due to an incident that happened in his school day where the ml bit his neck and though he had to take responsibility for what he did.
I would really appreciate it if you could find it despite the little information I provided