There are a ton of korean ones actually: Children of a Lesser God (one of my favs bc cults), Save Me, The Cursed (ongoing), The Guest, Tell Me what you saw (ongoing), Strangers in Hell, Possessed, The Ghost Detectiv, Catch The Ghost, the village:achiara’s secret—for dark gritty crime stuff, just watch everything released in recent years on OCN. Everything you’re looking for can be found in their dramas
Chinese (most ghost ones will probably be historical which I don’t watch much anymore so I can’t help there; bc of censorship, supernatural can be a grey zone): Day and Night, Guardian, Memory Lost, Love me if you dare, medical examiner Dr qin, when a snail falls in love, SCI
Japanese: Unnatural, Galileo, Trick (I know this drama is hella old but it’s definitely in the vein and has a million movies), Mr Brain, Strawberry Night (og version)... Japan does a lot of crime and they’re usually way grittier, just look thru each drama’s rec list bc their names escape me