He [Ha Sung Woon] was the first friend I made when I moved to Seoul. He’s the first non-school friend I ever made if you don’t include the other BTS members. We used to say, ‘Someday when we both make it big, it would be something special if we made a song together and sent it out into the world.’ That was the meaning behind it: something I wanted to do someday. We’d been talking about that for seven years, practically. We would show each other our songs or anything else we worked on whenever we made something. We kept that up and said, ‘Let’s try making some music together,’ and then we really did. It was fun. We tried so many different things. We called each other all the time, and I’m really grateful for the producer who worked with us because I was actually all finished recording, and I kept saying I wanted to try it again from the beginning when we were all finished recording, and I would say, ‘I’ll try it one more time,’ and I could tell that was a lot of hard work for them. It made me feel a lot of different things and it was an important learning experience. I think there were many moments that made me feel that way while we were working on it.