To this, Wendy replied, "Joy tends to be the emotional and sensitive one of us. When she listens to songs she likes, she often cries. She gets emotionally involved in the songs, she says."
In addition, Wendy shared, "Because there are harmonized parts in 'Best Friend', Seulgi and I practiced together at the dorm, facing each other. But the thing with the lyrics of this song is that even though it is about best friends, it can give off the feeling of lovers. And I mean even with your best friend, it can get awkward when you're face to face. It was hard to say those things [to Seulgi] while facing her. Honestly, it was pretty embarrassing."
Finally, when asked if Wendy wished to have the voices of any other Red Velvet members, she answered, "Each of them have very different voices. So I want to try having them all once. Seulgi has a slightly nasal sound. Mine is more warm like spring, but hers resembles the fall. Joy has a very refreshing voice. Yeri has a youthful, sentimental voice. I also like Irene's more assertive, yet emotional voice."