《A Boy》的詞曲由防彈少年團完成，其完整版歌詞如下：
(Verse 1)
I'm just a boy, 只是個男孩
from a broken home, 出自破碎家庭
no education, 沒有學歷
no money, 沒有錢
I'm just a boy, 只是個男孩
with a dream, 有個夢想
trying to make it, 試圖去實現
but it's a struggle, 但很掙扎
(Chorus)
But I won't give up, 但我不會放棄
cause I believe, 因為我相信
that one day I'll be singing these words to a sold-out stadium, 有一天我會在場館唱這些歌
I won't stop, 我永不停歇
cause I'm just a boy, 因為我只是個男孩
who's trying to make his dreams come true. 只是想要實現夢想的我
(Verse 2)
Everyday is a challenge, 每一天都是一個挑戰
got bills to pay, 有要付的賬單
got bills and debts, 有債務和欠款
got no idea how I'm gonna pay it all, 不知道如何才能付清一切
but I won't give up, 但我不會放棄
cause I believe, 因為我相信
that one day I'll be singing these words to a sold-out stadium, 有一天我會在場館唱這些歌
I won't stop, 我永不停歇
cause I'm just a boy, 因為我只是個男孩
who's trying to make his dreams come true. 只是想要實現夢想的我
(Bridge)
Seeing everyone getting rich, 看著其他人變富有的情況下
know I can't be happy for them, 我為自己不能為他們感到高興
got to believe in my heart, 心中還要相信
got to keep going. 我必須繼續前進
(Chorus)
And I won't give up, 我永不放棄
cause I believe, 因為我相信
that one day I'll be singing these words to a sold-out stadium, 有一天我會在場館唱這些歌
I won't stop, 我永不停歇
cause I'm just a boy, 因為我只是個男孩
who's trying to make his dreams come true. 只是想要實現夢想的我
(Outro)
I'm just a boy. 只是個男孩。