Based on a Thai legend, it tells the unearthly love story between Mak and his wife Nak who died in childbirth while her husband was at war and nevertheless remained around with her child both as ghosts. When Mak returns home, he finds his wife and child seemingly well.

In the wake of a deadly SARS outbreak that's turned ordinary folks into flesh-eating zombies, Thailand stands alone as the only nation to block the pandemic. That is, until the virus finds its way into a crowded Bangkok apartment complex.