Yeah, but that's by default. She was originally signed by SM Entertainment in Korea. Avex and SM are sister companies, so she's simply handled by Avex for her business in Japan. Basically, if you get into one company, you're automatically in the other. There's certainly a screening process, but by that point it's not about race or talent, it's about sales figures.

Plus, she's still Asian. Korean is a nationality, not a race. Asian stars swap countries all the time these days.