The true ending of the buried star. Who died?

Hello, I'm Wu. After comet Xu's accident, Zhang Zixian thought Wu was the murderer, but at that time, Wu had no reason to shark Zhang Zixian, so as long as he didn't pierce it, he would be fine. Later, the things in his backpack were discovered by everyone. Wu had reason to shark Zhang Zixian, and then she fled to the locker room alone and finally committed suicide.

The background of this story is a large entertainment talent show called "The Buried Star", and everything is decided by the votes. Despite the huge controversy, the program was broadcast to the final, and the audience needed to choose the final winner among the five contestants. But suddenly, the stage collapsed and five people and their staff were trapped in the ruins. There are no communication tools, only special smart watches receive messages. In the atmosphere of everyone waiting for help, an anonymous account sent a notice to everyone. ...