Early 2000s Asian gore/suspense flick

Fairly certain film was made between 2001-2004
Japanese maaaybe Korean made.
Opens with a grisly murder scene in a kitchen. Middle aged detective is our protagonist. Adorable schoolgirl is prominent. Murders continue. Final scene is in a white bathroom and it is revealed that the killer spirit is transferred by water similar to the premise of Fallen w Denzel.
Please help!

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2002?

rule number one?

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