《I'm Sorry》是NU'EST演唱的一首歌曲，歌詞如下：
中文版：
我 在鏡子前 裝扮著 我自認完美的形象
今天又要與你相遇 你的笑容能否化解我心中的疑慮
關於那些令人難堪的誤會
請你不要在心底
試著忘記我這樣低微的錯誤
親愛的 你知不知道 我比誰都還需要你
只是有時言語太過衝動 愛就變成 讓人誤解的遊戲
我想說 我不是故意傷害你
只是有時候心太急 才讓你聽到 I'm sorry
韓文版：
난 거울 앞에 mirror mirror 속에 비춰진 날
오늘도 너를 만나기 전에 난 네게 웃음으로 날 풀어줄래
아파할 듯이 쉽게 넌 화를 내잖아
그런 나를 너는 알고 있나요?
그런 나의 실수를
아직 많이 아플지도 모르겠지만
내게 기회를 줘요 제발 제발 제발
아직도 난 그댈 사랑하잖아
그런 나의 실수는 후회 없는 거잖아
I'm sorry I'm sorry I'm sorry
對不起 對不起 對不起
每個瞬間都如此的想你
這份思念該怎么去說明
現在的我該怎么去面對你
望著你的眼神 我卻說不出話來
望著你的眼神 我卻說不出話來
只能向你道歉 對不起 對不起
英文版：
In front of the mirror, I reflect on my image
Today I'll meet you again, can your smile melt away my doubts?
About those embarrassing misunderstandings, please don't keep them in your heart.
Try to forget about me making such a minor mistake.
Dear, do you know how much I need you?
Sometimes words can be too much and love becomes a game of misunderstandings.
I want to say, I didn't mean to hurt you.
It's just that my heart was too quick to speak, and you heard I'm sorry.
I may still be in a lot of pain, but give me a chance, please.
I still love you, my dear. My mistakes are regretless, right?
I'm sorry, I'm sorry, I'm sorry.