Meet the KC-100, a four-seat design being worked on by Korea Aerospace Industries.
The goal is to build and certify (both FAA and EASA) a fast, four-seat tourer. It'll be powered by a 315hp, turbocharged, full FADEC engine (my money is on Continental).
The site declares a top speed of 240kt, although it isn't entirely clear if that refers to a Vne (which would be understandable) or a full power cruise at altitude (possible I guess, but stretching it a bit). MAUW is said to be 3,600lb (1,636kg) with a payload of 1,100lb (500kg).
It'll be interesting to see if the project gets finished, and even more interesting to see the price…