I did log into my Kakao Account, but the IP location was different from my physical location.

If you use mobile network (3G or LTE) or VPN, the IP location may be different from your login location,
Please bear this in mind and check once again whether you have a history of logging in on the day you received the login notification. 

* The IP locations indicated on the website provided by KISA show the location of Internet service providers, and may be different from the actual login locations.
If you received a Kakao Account Log In Notification and it is an act you do not recognize, please change your Kakao Account password as well as the password for your email account.
Make sure your Kakao Account password is different from the password for your email account.