The similarities between these two crime/drama/thrillers are great. In The Departed, director Martin
Scorsese takes the story into his own style of storytelling, but the adaptation of the screenplay originally written by director Siu Fai Mak and Felix Chong is almost identical to the screenplay by William Monahan adapted for The Departed. The key overall difference between the two films can be attributed to their setting. Infernal Affairs, based in Hong Kong, was adapted or “Americanized”