What does the hostess of Byakki Smoker use to deliver the note?

In the movie Byakki Smoker, the note passed by the hostess was stained with blood.

Byakki Smoker is a thriller directed by Assaf Bernstein and co-starring India Aisley and jason isaacs. The film was shown at Sundance Film Festival on1October 27th, 20 19 65438. The film tells the story of a young woman named Maria. She has an unknown secret, which not only affects her family, but also affects her relationship with people around her, and even threatens her life.

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