It looks like this post contains a link that does not use a secure protocol: http://accounts.binance.com/ko/register?ref=MFIX59H5
HTTP is in use instead of HTTPS and no protocol redirection is in place. Be careful and do not enter sensitive information in this website as your data won't be encrypted.
It's also a good habit to always HOVER LINKS to see the preview in the bottom-left corner of your browser.