[Verse 1: Wendy]
Of all of the countless people
How could I identify you?
Why was it you?
It's like the seat next to me, from the beginning
Has always been filled by you
Everything was natural

[Pre-Chorus: Wendy]
Even your voice's tone and small habits
Gradually seep in before I realize it

[Chorus: Wendy]
You, you’re my best friend
Forever, never end
To me, you are a story that will never end
It means you, you
For infinity, bigger than the universe
Oh you, you’re my best friend

[Refrain: Wendy, Seulgi]
Uhh
Yeah, yeah

[Verse 2: Seulgi]
You're always going to be by my side at the closest place
You're the only one
Even if a long time has passed
You are the person who will always protect me

[Pre-Chorus: Seulgi]
Oh, even a heavy sigh after a long day
Will disappear in the warmth of your comfort

[Chorus: Seulgi, Wendy]
You, you're my best friend
Forever, never end
To me, you are a story that will never end
It means you, you
For infinity, bigger than the universe
Oh you, you’re my best friend

[Bridge: Seulgi, Wendy]
Always covered with constant comfort
With a bigger warmth than anyone else's
Even if I look at you, in the midst of laughing
I feel like I don't have to say anything

[Chorus: Both, Wendy, Seulgi]
Oh you, you're my best friend
Forever, never end
You're a story that can never end
It means that you and I are together
I will always protect you
Oh, 'cause I'm your best friend
(You’re my best friend)

[Outro: Both]
Thank you, my best friend