Lam Ka Yi (Maggie Cheung) is a kindhearted girl who was electrocuted while saving a kid from a falling signboard. Passerby Ku Dak Ming (Roger Kwok) tries to revive her through mouth-to-mouth resuscitation, but fails to bring her back to life. However, this incident causes Ka Yi's spirit and Dak Ming to have a special link. Thus, when Ka Yi learns that her future parents are actually her cousin Man Siu Ying (Monica Chan) and Dak Ming's best friend Fong Chi Lung (Nick Cheung) who are loggerheads, she tries to get Dak Ming to help bring them together, much to his frustration. Nevertheless, Ka Yi and Dak Ming found themselves falling for each other over time; but can a ghost-human relationship work out?