Calvin Chen
KO One () is a 2005 Taiwanese drama starring Jiro Wang, Calvin Chen, Aaron Yan and Danson Tang. It was produced by Comic International Productions () and Gala Television, it was first broadcast in Taiwan on cable TV Gala Television (GTV) Variety Show/CH 28 (八大綜合台) on November 26, 2005 to May 27, 2006.