You're referring to Shinee aren't you? :D Cherry explained it perfectly, in the song when they say 'her whisper is the lucifer', they are comparing the woman to lucifer (better known as the devil) because she is tempting. Hope that helped a little! :)

Lucifer is a spirit of light, that whispers into people's ears, that they are better than God.

Here it means metaphorically that her whisper is tempting and inviting , since Lucifer represents the tempter of mankind.

Hi, I think it's a bit more confusing considering the lyrics were translated from the Korean. Sometimes the meaning of a concept or a phrase such as "Lucifer" is simplified somewhat when translated between cultures. Cherry, Amanda and Eliot have given the best indications: Lucifer as a kind of temptation.

靚仔。。這個是歌詞不??她的聲音是魔鬼。。。差不多是這個意思。。。= =