《Heartbeat》的歌詞如下：
Verse 1：
You're the only one I want to see
The only one I need to feel
I'm so lost without you here with me
Chorus：
Give me a heartbeat, a heartbeat
Just like the one we used to make
Give me a sign, a sign
That you're feeling the same way that I do
Verse 2：
I can't sleep without the touch of your skin
I can't breathe without the taste of your breath
So come back, baby, I need you again
Bridge：
Don't leave me here alone again
Come on, give me something to believe in
Don't give up on me, baby, don't give in
Chorus：
Give me a heartbeat, a heartbeat
Just like the one we used to make
Give me a sign, a sign
That you're feeling the same way that I do
Outro：
Baby, don't give up on me tonight
Baby, don't let go, don't let go of my hand tonight
Yeah～ Baby～ 就這樣 牽著我的手 回到我的身邊吧