"Blood Rain" ("Hyeol-ui Nu") is one of my favorite, although seldom filmed, genres; the period detective thriller (think
The Name of the Rose). In a simple formula you take the standard Holmes/Watson archetypes and thrust them into the past into an exotic setting with different rules.
In this case the exotic setting is 1808 Korea during the Joseon Dynasty, on a tiny isolated island called Donghwa famed for its paper making. The tribute ship from Donghwa, loaded with the paper for the Emperor, has been burned in an act of arson. This instigates an official investigation from the government to uncover the responsible party for the treasonous act. Official detective Lee Won-kyu (Cha Seung-weon) arrives on the island and discovers that the problem runs deeper than the burning of the tribute ship. A series of gruesome murders spark rumors of the vengeful ghost of Kang, a local island ruler who had been executed years ago for the crime of practicing Catholicism. Detective Lee's sharp intellect cuts through the superstitions of the native islanders, driving towards the true culprit for the crimes.
While in no way a horror film, "Blood Rain" delivers on gore and supernatural chills while telling an effective detective drama. Director Dae-seung Kim wants to keep you guessing as to the true nature of the crimes. Is it, as detective Lee suspects, a local person with a grudge using the ghost of Kang to cover his or her actions? Is it, as the locals themselves believe, the long dead spirit of vengeance finally collecting on a debt long due? The answer may surprise you.
Definitely a bloodier film than most in the genre, "Blood Rain" is not for the feint of heart. A man is drawn and quartered, a spike is thrust into a head and the blood flows like rain. The DVD case actually emphasizes the gore in the film, making it seem more like a horror story than the detective film that it is, which is a shame, but that is movie marketing for you.
If there is any weakness in "Blood Rain," it is in the slow drawn out pacing capped by a rapid climax and solution. With a running time of 103 minutes, the majority of the film is dedicated to detective Lee's investigation, with only the last 15 minutes or so being the conclusion. I know this balance has frustrated some viewers, who feel a bit betrayed by the rapid and ambiguous conclusion.
I personally really enjoyed "Blood Rain," with all of its sweeping pageantry, full of funny hats and ancient court manners, coupled with the dirt and grime of a paper-making factory, and the blood and gore. Detective Lee is a highly effective character, and his dogged pursuit of the truth keeps a straight line through an otherwise chaotic plot.