Taemin: “I was supposed to do all the singing part and rap in ‘Pretty Boy’, but I thought Kai would match more to the rap part than me. And I wanted to do it with him. So I highly recommended Kai and pestered that he’d do it with me. Kai positively joined and I’m really thankful.”
Kai: "Since I thought of our stage from long time ago, I readily agreed when Taemin suggested singing with him. I thought that I could show both rap and smart performance since ‘Pretty Boy’ has a beat in it. Taemin is a good friend of mine and a senior at the same time, so I tried to do my best not to harass him, and so I could join with good mind as a friend too."