The 'My NTS' menu can be found on the National Tax Service (NTS) Hometax website. After logging into Hometax (www.hometax.go.kr), you will typically find the 'My NTS' option in the main navigation menu, usually located at the top of the page.
This service consolidates your tax-related information, such as tax payment history, refund details, tax filing status, and more, providing a centralized view of your tax affairs.