Very miniature tea porcelain set? Chinese , Japanese, or Korean or?

This is very tiny, (see wine cork), but beautifully painted, people look Japanese to me, but parts look Chinese, but I am not smart at porcelain, and can not read bottom of teapot, also bottom or plate signed same. I think it is too beautiful for child's set. The three cups and tea pot fit perfect on the plate. Any information would be appreciated. Thanks toracat