此前FTIsland李在真为电视剧应援演唱的《百年的新娘》OST Part1《进来》和Part2 2Young《My Girl》，男主角李弘基和AOA初雅分别演唱的OST3、4《还未说出口的话》都与电视剧一同获得观众喜爱，此次公开的《不是的》同样备受期待。
《百年的新娘》由太阳集团长子的第一位新娘将死于家族诅咒而展开，讲述其中产生的真挚爱情与阴谋，
百年的新娘剧情。极具东方神秘色彩的题材和李弘基、杨真诚等主演的精彩演绎，使该剧不止在韩国国内，在海外同样获得超高人气。
《百年的新娘》OST Part5《不是的》 英文歌词（by全根华）
The person who used to smile for me
The person who was endlessly kind
Where is she? What is she doing? How can I find her?
The person who used to smile for me
The person who loved someone as bad as me
Is she well? Is she happy? I don’t hear anything about her
Do you know? Do you know that person?
The person who I’m grateful for, the only person I loved
Do you know? I still love that person
Do you know that person?
Doesn’t know, that person doesn’t know
That foolish person only knew how to give
Doesn’t know, that person doesn’t know
How great of a love she gave me
The person who only knew me
The person who forgave someone as bad as me
I had to let her go without even telling her thank you or sorry
Do you know? Do you know that person?
The person who I’m grateful for, the only person I loved
Do you know? I still love that person
Do you know that person?
Doesn’t know, that person doesn’t know
That foolish person only knew how to give
Doesn’t know, that person doesn’t know
How great of a love she gave me
Do you know? Do you know that person?
I know, I know that it was love
Although it’s too late
Now I know
