It is the default Korean system font. On Mac, you can manage or download additional weights using the Font Book App .

If you still wish to download the specific Apple SD Gothic Neo file, be careful. Many "free font" websites bundle malware or adware with their downloads.

and look for "Apple SD Gothic Neo." If it appears dimmed, select it and click "Download". Free Alternatives for Windows/Web

Best for: Windows users who own an iPhone or Mac. Apple legally allows you to install iCloud for Windows. This package includes a suite of Apple system fonts, including .

If you are already on an Apple device, you likely already have it or can enable it for free: macOS & iOS