We have detected suspicious login behavior and further attempts will be blocked. Please contact the administrator

You entered the wrong password in MYCLOUD, so login was blocked. please solve it

@JeongSeongSik

Did you enter the correct password? If you’ve forgotten your password, then create a new one.

User Manual: My Cloud Home and My Cloud Home Duo (westerndigital.com)

I will endeavor to figure it out for extra.