[Verse 1]
[Liam]
You're insecure,
Don't know what for,
You're turning heads when 당신 walk through the door,
Don't need make-up,
To cover up,
Being the way that 당신 are is enough,

[Bridge]
[Harry]
Everyone else in the room can see it,
Everyone else but you,

[Chorus]
[All]
Baby 당신 light up my world like nobody else,
The way that 당신 flip your hair gets me overwhelmed,
But when 당신 smile at the ground it ain't hard to tell,
당신 don't know,
Oh oh,
당신 don't know you're beautiful,
If only 당신 saw what I can see,
You'll understand why I want 당신 so desperately,
Right now I'm looking at 당신 and I can't believe,
당신 don't know,
Oh oh,
당신 don't know you're beautiful,
Oh oh,
That's what makes 당신 beautiful

[Verse 2]
[Zayn]
So c-come on,
당신 got it wrong,
To prove I'm right,
I put it in a song,
I don't know why,
You're being shy,
And turn away when I look into your eye eye eyes,

[Bridge]
[Harry]
Everyone else in the room can see it,
Everyone else but you,

[Chorus]
[All]
Baby 당신 light up my world like nobody else,
The way that 당신 flip your hair gets me overwhelmed,
But when 당신 smile at the ground it ain't hard to tell,
당신 don't know,
Oh oh,
당신 don't know you're beautiful,
If only 당신 saw what I can see,
You'll understand why I want 당신 so desperately,
Right now I'm looking at 당신 and I can't believe,
당신 don't know,
Oh oh,
당신 don't know you're beautiful,
Oh oh,
That's what makes 당신 beautiful

Na Na Na Na Na Na Na Na Na Na
Na Na Na Na Na Na [x2]

[Middle 8]
[Harry]
Baby 당신 light up my world like nobody else,
The way that 당신 flip your hair gets me overwhelmed,
But when 당신 smile at the ground it ain't hard to tell,

[All]
당신 don't know,
Oh oh,
당신 don't know you're beautiful,

[Chorus]
[All]
Baby 당신 light up my world like nobody else,
The way that 당신 flip your hair gets me overwhelmed,
But when 당신 smile at the ground it ain't hard to tell,
당신 don't know,
Oh oh,
당신 don't know you're beautiful ([Harry:] Oh),
If only 당신 saw what I can see,
You'll understand why I want 당신 so desperately ([Harry] desperately),
Right now I'm looking at 당신 and I can't believe,
당신 don't know,
Oh oh,
당신 don't know you're beautiful,
Oh oh,
당신 don't know you're beautiful ([Harry] beautiful),
Oh oh,

[Harry]
That's what makes 당신 beautiful

[From: link