Straight-laced architect Tony (Tony Leung Kar-fai) is infatuated with beautiful co-worker Ellen (Ellen Chan Ar-lun) but cannot get to first base and suffers constant abuse at the hands of her boorish boyfriend, Michael (Michael Chow Man-kin). While inspecting a construction site, Tony is attacked by a ghost and apparently falls to his death. He awakens in a bizarre netherworld and is about to be assaulted again by the same spectre but is saved in the nick of time by the lovely spirit, Chia (Rosamund Kwan Chi-lam). However, in the process, he accidentally breathes into her mouth. Now possessing some of Tony's Yang energy, Chia shares all of his physical and emotional responses. Although Chia proceeds to create havoc at Tony's workplace, he still hopes that she can use her powers to make Ellen fall for him. This, of course, does not go entirely as expected and, to make matters worse, Tony's slimy co-worker, Peter (Peter Lai Bei-tak), is plotting to steal Chia away. However, this backfires when his breath ends up going into the ghost's father (Woo Fung) instead, leaving them connected as well.