Hiii

Could anybody help me find this one BL? I remember the MC is haunted by the ghost of his dead ex bf appearing in his apartment at a specific time during the night I think. Then he has a neighbor (?) which is the ML or something that helps him and lets him stay over and they ultimately solve the case of the dead bf's murder I believe? It's a very unique plot even among "MC can see ghosts" stories, but for some reason I can't find it. Thank you!