Detective Dee and the Mystery of the Phantom Flame (2010)

Both movies are set in ancient times, and both involve detective's who are asked by the Monarch to get to the root of a series of murders.

Detective K seems to be a ripoff of Detective Dee.
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The Detective Dee films, directed by Tsui Hark, are a smash hit overseas—in order of release, the three entries are Detective Dee and the Mystery of the Phantom Flame, Young Detective Dee: Rise of the Sea Dragon, and Detective Dee: The Four Heavenly Kings.

The Detective Dee films, directed by Tsui Hark, are a smash hit overseas—in order of release, the three entries are Detective Dee and the Mystery of the Phantom Flame, Young Detective Dee: Rise of the Sea Dragon, and Detective Dee: The Four Heavenly Kings.

Both are about a monster on killing spree of killing members of chinese Imperial family, court. Both movies are very similar...................

Both historical action packed movies revolve around one mystery case and the King/Queen during those eras sent one public and one private group to investigate. One male lead stars in both movies.

Both films are quite suspensful, have mysteries, and have a dollop of wuxia thrown in.