Needing You is a comedic love story about Kinki Kwok (Sammi Cheung ) a dysfuntional office worker at an electronics firm down on her luck with love. She's just as her name describes, a little out of whack, with her refusal to cry when she's upset and preferring to something more useful like clean the office's washroom or the interior of a car. And it just so happens she's secretly seen her boyfriend with another woman.

Enter Andy (Wai-Siu) Cheung (Andy Lau) the manager in her department full of gossipy co-workers. Things seem to only to be getting worse for Kinki with Andy around, as she is constantly receiving the blame of the office's misfortunes. However, when Kinki manages to get Andy out of a sticky situation, he discovers some newfound respect for her loyalty and willingness to help while Kinki thinks she may have deeper feelings for him. Together, they plot to get back at Kinki's double crossing boyfriend and Andy's feelings for Kinki reciprocate. To further complicate things, Fiona (Fiona Leung ), an old flame of Andy's reappears and tries to hook Kinki up with young .com billionaire Roger (Raymond Wong ), while Andy has been accused of wasting company money on a failed project.