In the time of the Qing Dynasty, the Emperor Yongzheng created a secret army known as the Guillotines. It was the job of the Guillotines to protect the Emperor by killing anyone who posed a threat to him or his rule. After 348 successful missions to eliminate their target, the 349th assignment proves to be their last.

Khmer Rouge terrorist Kieron Chow and his unit arrive in Hong Kong for their latest mission. Todd, Chow's son and fiercely loyal right-hand man, sustains a serious head wound. Now a total amnesiac, Todd wakes from a coma to find he's been given a new life, one that may be the death of him. With the help of psychiatrist Shirley Kwan, anti-terrorist officer Mark Chan tries to convince Todd that he is actually an undercover cop sent to infiltrate Chow's group. As fragments of his shattered memory return, Todd is forced to choose between his dark past and this one shot at redemption

This movie goes through 12 significant nights (not consecutive nights) in a relationship between two characters. The movie offers some insight into the repetion involved in relationship cycles from interest through various tensions to eventual disinterest.