hi! im just here to give a few more details on the lost serial killer × detective fic. i think jungkook was the serial killer (but i could be wrong) and im not sure if it was taekook or jikook. it was a long long fic, chaptered, and the ending had something to do with a railway track. i hope that helps! i'm sorry i don't know more :(
hey! i read a fic a really long time ago that was incredible. I think it could have been jikook but im not 100% sure. It was like a serial killer x detective type thing. And jungkook was a psycopathic serial killer and it was sort of like a killing eve type thing. i remember a scene where jimin (or whoever the detective was) comes home to find someone who wronged him tied up in his apartment, and jungkook is there and wants jimin to kill the guy. And then another scene where they go on this midnight drive together because nobody can know. And it was all very complicated and i'm explaining this horribly but i thought maybe it was worth seeing :)
(thanks to @ladyc0312 for the suggestion!) ok i've spent too much time on ao3 trying to look for this elusive fic, and I still don't think i've found it, but I'm just gonna post a few that are along the same vein:
Jikook/Taekook + Serial Killer AU/Detective AU
TW: these are all heavy fics with serious topics so read the tags carefully and proceed with caution!
Heathen by Daebon (Jikook, 31 Chapters, E, 161K)
when the caged owls sing by taetaeggukkie (Taekook, 4 Chapters, E, 32K)
The Depraved Duet (series) by nocturnehelli (Jikook, 2 works, E, 224K)
Bonne Nuit, My Angel by HighFunctioningFan (Jikook, 2 Chapters, E, 17K)
I genuinely don't know if these are anything at all, most likely the author has deleted it but I could try and keep looking if you really want me to?