Chanel Chiu, a lethal assassin, adheres to a straightforward principle: a promise is sacred and must always be kept. This lesson was instilled in her by her husband of a decade. On the other hand, Dior Mok, a skilled thief with a similar deadly reputation, despises unfaithful men, a trait she believes her boyfriend lacks. However, unbeknownst to both women, they are involved with the same man, and neither is willing to relinquish him without a battle.