After Wang Yun Yun left, Li Yong called Li Tianmei and instructed Li Tianmei to lock up this room, not to let anyone just come in, and not to call anyone in to clean it for the time being.

You can't clean it until a month later, after the half-life of the zombie poison.

In Li Yong's memory, there were people who had contracted zombie poison in rooms where zombies had lived.

However, after a month, it is no longer contagious.

So, the ancient magicians figured out the ...