Installing the correct Koorui monitor driver is vital for several reasons:

When you unbox a new Koorui monitor—whether it’s the popular 24E3, the curved 27N6C, or the ultrawide 34E6C—the first question that often comes to mind is: Do I need to install a specific Koorui monitor driver?

You are using the wrong cable. Fix:

Yes. Most budget and mid-range monitors no longer include physical media. Download the driver from the official Koorui website.