Haunted Office is three stories centered around an office setting, with each story directed by a different director and featuring a starry cast. The first story is about how a new office worker (Karen Mok) finds out the hard way that no one uses the last stall in the ladies' restroom. In the second story, Ken (Stephen Fung) must choose between two girls, one of which may be a ghost. In the last story, Mary (Helena Lo) is fired the day before her retirement, which means she will lose all her pension. Nonetheless, she is going to make sure that nothing will prevent her from coming back to a place where she has worked for 45 years.