The items sold in the Confucian Temple are more Japanese-style. Regarding the Korean Wave, I went to see only one SJ shop a few days ago... The other Korean Wave stores seem to only sell cards and stickers. .
Sanxiashe is in Xigong. There are many more shops there than in the Confucian Temple. There should be more Korean things, and it is not limited to Sanxiashe.
So I personally recommend the poster to go there. Nishinomiya.