It's a dark, violent and gritty thriller nominally focused on the hunt for a sadistic serial killer. Although based on a Japanese novel and set in Taiwan, the dour tone and deliberate pace are reminiscent of Scandi-Noir. Genre cliches abound and the show doesn't shy away from depicting brutality. It's also guilty of the same thing as virtually every other streaming series in padding the run time with extraneous subplots and overcooked melodrama. That said, this show is nevertheless well-done and engaging, with good performances, slick production, and enough twists and turns to keep things interesting.