Hi, @jaesik87. Thanks for reaching out!
Which theme are you using?
I recommend starting to troubleshoot this by checking the color settings of your theme to see if the menu font color is set to be transparent, or the same color as the background. You can find the color settings by going to ‘Online Store > Themes > Customize > Theme settings’.
Let me know what you find!
Helen | Social Care @ Shopify
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