Zeph has a huge obsession with the word "promise", not because it can be bestowed easily but because she can keep it. Her Parents is producing perfumes and supplying it to the well knowned Salvatierro Perfumery. Salvatierro's are close to their Family, too close that even the heir himself got associated with her in a bad way. The approach of Khai Salvatierro is just too annoying that she could kill him anytime their paths meet. What will you do, if the one you hate the most is actually bound to marry you?