After the death of her policeman father, Xiaomai begins to look over his old journals filled with notes about the cases he investigated over the years. The mention of a purple scarf in the notes particularly catches her attention, prompting her to purchase a similar scarf from a mysterious website...
The iconic cat-and-mouse duo accidentally travel through time in a museum. Along their journey, they meet a group of intriguing new companions and become involved in a final showdown with mysterious forces.
