Where is the center of Dongguan (where Japanese and Korean idols and books are sold)?
I also arrived in Dongguan a few days ago. Although I don't know where you are looking, I know a super-large library, the size of a building, with many books in it. This is an advanced library, next to the square. Just ask the guards in the central square. . . You can look inside, maybe you can find what you want. . . .