Wei Ran, a college graduate, is accidentally led by a cat into a world he never thought existed. While trying to find a way to return home, he learns that the only train capable of taking him back to the human world will not arrive for half a year. He can only temporarily reside in the shop run by Mao Mao Yaya, known as Guaixiang Sale. Just as life seems to be settling down, Wei Ran unexpectedly discovers that dragon scales appear no matter where he goes. Each time the dragon scales appear, they cause completely different strange effects...