Johnnie To and Wai Ka-Fai's Milkyway Image films, such Election, Election 2 and Mad Detective enjoyed Hong Kong box office successes and were sold to a slew of foreign territories (including United States, France and Argentina).
Johnnie To is the principal director and filmmaker at Milkyway Image, as the majority of Milkyway Image films have been directed by him, sometimes in collaboration with Wai Ka-Fai.
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She is a long-time screenwriter for films directed by Johnnie To and/or Wai Ka-Fai of Milkyway Image and frequently works alongside writers Wai Ka-Fai, Yau Nai-Hoi and Yip Tin-Shing.
He often collaborates with fellow Milkyway Image writers Wai Ka-Fai, Szeto Kam-Yuen, Au Kin-Yee and Yip Tin-Shing.