Please keep adding more cast members to K-drama Knock Off, this is the most entertaining casting train I can recall in years and makes for good positive news in a week full of negative stuff. Woo Do Hwan is the latest to join the 1997 period era set Knock Off, with his agency saying that he will be playing a special guest starring part so probably an important character but not much screen time. At this point with over a dozen names in the cast headlined by top actor Kim Soo Hyun, my guess is anyone and everyone wants to partake of what will be a tentpole drama and a good chance of being a ratings hit.