When the Hong Kong government enacts a ban on smoking cigarettes indoors, hard-core smokers are driven outside and a budding romance develops between two co-workers.

When old flames reunite, will it be second time's the charm or a case of once bitten twice shy? Jimmy and Cherie, two ex-lovers from Hong Kong, cross paths in Beijing and can't seem to forget each other, despite being involved with someone else. Torn between fidelity towards their new partners or following their hearts, they explore the struggles, doubts and fears that exist among modern young couples.

Shawn Yue and Miriam Yeung reprise their popular roles as a star-crossed couple who strive to stay together happily ever after, only to find their already precarious relationship further strained, when Jimmy’s childhood friend asks him to donate sperm, and Cherie is troubled by the re-marriage of her father.