This is a long shot but idk where else to ask. It wasn't actually a webtoon I don't think because I could only find it in the books that were sold of it and then a downloadable version somewhere sketchy.
It's about a cop or investigator mc who has black hair, who is in a remote house with a serial killer (who Im pretty sure had orange hair) which I think is at the serial killers request. He basically interviews him but has flashbacks and nightmares every night and then I think they fuck?? It's psychological thriller and there's this huge plot twist with amnesia and all this stuff, I remember one of the covers being the main character or killer holding a skull?? I remember seeing it sell on Amazon for over 100 dollars and it's just super hard to find in general for some reason. I cannot for the life of me remember the name but it kinda blew up on TikTok for a bit because of how dark it was and ppl loved the art.
Does anyone have any recs where the characters resemble itafushi (at the very least look wise but obvi if the personality matches too) there's just not enough DJs of them (´;︵;`) (also preferably with the black haired one as the uke)