Who was the director of the 2004 Hong Kong martial arts film starring the actress whose nickname is "Dingding"?
Throw Down (film): Throw Down () is a 2004 Hong Kong martial arts film directed by Johnnie To and starring Louis Koo, Aaron Kwok, Cherrie Ying and Tony Leung Ka-fai. Cherrie Ying:  Her nickname is "Dingding" (丁丁), and she is often credited under the name Cherrie In.
Johnnie To