Pu Pu is dumped by her boyfriend whom she loves. Before she moves out, she asks to listen to "their song" just one more time, that is the hidden track by Jay Chou. Then she leaves him and goes to her sister's place in Hong Kong. All the while she is there, she searches for the same song, the "hidden track", and from this it leads her onto a journey of discovering love and a new beginning. Despite the whole movie revolving around Jay Chou's song, Jay Chou plays only a cameo part.

Hidden Track

The melancholy Candy runs the Half Mortal, a trendy bar in Hong Kong. She hires Paul; Stella, a part-time employee who's a college student in psychology, trains him. He has a gift for mixing the perfect drink to fit each customer's emotional needs. His own emotions, however, are complex: his father, an alcoholic, has died recently; he's abandoned his studies; and, although he's likes Stella, he's a tyro with women and inarticulate with her. Is alcohol the key to happiness, as Paul wonders; does it simply change peoples' personality, as Stella thinks; or, is it just there, as Candy's business sense tells her? Can Paul and Stella blend into something smooth?