Dumped by her fiance just two months before their wedding, comic strip writer Sophie hatches an elaborate plan to get her Jeff back and punish the movie star, Joanna, who seduced him away. She finds herself a partner, Gordon, an ex-lover of Joanna's. The two start on a comic adventure full of laughs and tears, aided by Sophie's two best friends, Lucy and Lily. At the eve of her success, Sophie suddenly faced of having to chose between a repentant Jeff and Gordon who has fallen for her.

Kate stars opposite Richie Ren (or Jen, depending on what rocks your boat), as couple Rachel and Fat. They're the atypical modern day couple living it up in Beijing, though the latter is suspect of the former's promiscuity. He loathes the time when he has to bring his girlfriend back to the village to meet his parents, and to get the stamp of approval from his father (played by Yuen Wah). So they device a plan, and that is to look for a substitute girlfriend (hence the title Contract Lover), whose mission is to be as disgusting as possible, so that Dad will tell Fat to find anyone else better than the current beau, and hence, for Fat to introduce Rachel.