Watch Horseplay for Free: How to Stream the Movie Online at 123Movies. . Desperate for a real news story, entertainment journalist Mui goes to London to cover an antique auction in order to trace the path of Nine-Tailed Fox, a famous art thief who has eluded capture for decades. Playful, but clever, the Fox decides to use Mui as his partner for his latest heist, a set of pottery horse from the Tang Dynasty. What the Fox doesn't know is that Mui is secretly working with Cheung Ho, a Hong Kong cop that has been obsessed with catching the Fox since letting him escape years ago. The result is a twist-filled pursuit that takes the trio from London to Prague.