The woman in red had an affair with a gang member. After she discovered that the other party was a gang member, she decided to separate the relationship with the gang member. But the gang members threatened her and tortured her to death in the most cruel and terrifying way. The woman in red knew that she had nowhere to escape, so she hired a rooftop killer to give herself a sweet death.
The lines in the movie have actually explained the plot. The killer said, "You are tired of running away, you are ready to face what you will eventually face, but you don't want to face it alone." The killer killed her and said "I'll cash her check in the morning". This sentence is translated into "I'll cash her check in the morning" in the movie. In fact, it is wrong here. This sentence is completely literal. The meaning of the above: "I will cash her check tomorrow morning". The cheque was given to him by the lady in red.
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