Hi @TaekoY
Thank you for letting me know that! In this situation I would recommend reaching out to our live support team for further troubleshooting. This way they can authenticate your merchant account and assist in reviewing your checkout settings and available currencies.
You can use this link to access our live support: Shopify Help Center. Next, you will want to follow the on screen prompts to sign in, choose your topic and issue and at the bottom of the help articles provided will be all available live support options.