A girl who is a genius spy was executed after making a mistake, but because of the Manzhushahua hidden in her hair on the back of her neck, she traveled into a super-young code without knowing the plot and became Xia Changan's sister.
The wheel of fate starts to turn. What is the identity of the mobile phone person who is always around?
In a strange world, will the girl with Manzhushahua destroy or save the protagonists?