Cao Duyuan (1958-9 December 2005) was a Chinese-born member of the Snake Flower Triad who lived in Yokohama, Japan during the 2000s. On the night of 9 December 2005, he and dozens of fellow triads were sent to chase down Makoto Date and Kazuma Kiryu as they drove a rescued Haruka Sawamura down the freeway to Tokyo, but Kiryu used Date's gun to shoot their pursuers.