Killing Cafe

In the cafe, Luo Yan found a few lines of strange words written on his cash register receipt: [Rule 1: Don't trust anyone. [Rule 2: Don't leave the cafe. [Rule 3: Don't ask the clerk anything. Suddenly, a girl with long hair hesitantly walked up to Luo Yan. Another cashier receipt was spread out in her pale palm: [Rule 4: The use of any weapons is prohibited.