Guogu has an official Taobao shop, so you can buy it directly on Taobao, which is absolutely positive, so don't worry about the fake valley.

Guogu is a virtual periphery, such as cartoon posters, hand-made things, etc. Second dimension is a special term in ACGN sub-cultural circle. Early Japanese animation, comics, games and other works are all composed of two-dimensional images, and their pictures are a plane from our perspective, so the virtual world created by these carriers is called "second dimension world" by animation lovers.