Dispute over a key, Reivew on Grand Piano

The film goes on for 90 minutes, but it's actually very simple to sort out the context carefully: the killer learned that the hero's teacher had a safe, and the teacher put valuable property in the box before his death and deposited it in a Swiss bank. The key to open the box is hidden in the classical piano played at the male lead's concert, and in order for the key to roll off the piano, the most difficult piano piece that is repeatedly mentioned in the film must be played, There must be no mistakes and omissions during the performance, and after the last four bars are played, the additional keys of this classical piano must be long-pressed to finally unlock and obtain the keys. The secret about the key was not fully explained at the end of the film. I only heard that a metal object fell to the ground, and the hero leaned over to pick it up, and the subtitles appeared. But when you read the subtitles carefully, there is a golden key under the title, so all the mysteries are solved.
John Cusack became a seiyuu, and he sacrificed himself for justice within a few minutes of his debut, which is jaw-dropping! The overall suspenseful color of the film is not strong, the rhythm is also slightly protracted in the repeated dialogue between the two, and the setting of the plot content is also a lot of flaws: 1. Why not give the key to the children instead of hiding it like this profound? 2. How does the killer know the way to get the key, while the others don't? 3. What's even more funny is that, in order to get the key, why didn't the killer find the male protagonist to play on the piano alone, instead of choosing to use sniping as a threat at the concert to force him to submit? You must know that the male protagonist who has failed to perform will inevitably make mistakes after reappearing on the stage, and once he makes a mistake, the key will not appear at all. I don't understand! Quan Dang is the director's not-so-successful attempt to innovate the film.

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