What does the end of 1 mean?

The ending shows that the police and the female reporter colluded in this farce, and everyone was killed by the police.

Finally, it was found that the murderer was a policeman and escaped with his master. At the same time, it was too late for other policemen and hostess to find out the truth. Before he died, they found that the mentally retarded policeman was actually faking it and showed his true colors when he ran away. Except for the last girl, all the killers were mentally retarded policemen. ?

A story of screaming and laughing;

In an American high school, six middle school students held a party on carnival night, but accidentally killed a passerby. In order to be able to hide, they may lose everything. So on second thought, they decided to destroy the body. However, when they returned to school, an anonymous threatening letter claiming to know what they had done suddenly appeared.

Suddenly, one day, Pearl, a girl who continued to participate in the incident, was murdered near her home, and many media and police came. Since then, others have been trapped in the murdered shadow of fear. They all took various measures to prevent their own death, but the murderer always used some funny means to kill them.

Reference to the above content: Baidu Encyclopedia-Beijing Zodiac Health