On a V Live album preview in June 2018, RM said:

It’s a song that we had the most difficulty. We don’t choose a title song of many songs that we’ve worked on so far. We make the title song with a clear picture and concept. So we fix the title song in the beginning. When we heard the beat at first, Suga mentioned this. But when we first heard the beat, we thought that it’s amazing and unique. We thought that this is it. That’s why we had the most difficulty working on the song. I wrote the melody for it for about 20 times. I worked on the ‘Love you so bad’ part. ‘Love you so bad,’ that part. I only built the foundation of this and wrote the rap part. Pdogg and producer Bang worked on the rest. I found producer Bang very amazing because he created a completely different song. It was a great song to begin with, but it was very much of a pop song. We had to think about whether we could do this, whether it’s our style, and whether we could sing and perform to this. That’s why title song is difficult. You need the right tempo and melody for performance. Only then choreographers can make the dance.That’s the most difficult part, and producer Bang solved that. There’s a guide that I made at first. Let me play it for you to give you an idea. […]

If you listen there’s no guitar sound that covers “Fake Love” overall. It’s a completely different song. It used to be more depressing and deeper. It was very deep, but to adjust to the voice range of our vocalists, we change the pitch in the end. Rappers have difficulty adjusting to that. As far as I know, it went up by 6 and a half pitches. Six and a half. That makes a totally different song. We adjusted to that pitch and added the guitar sound. That’s the “Fake Love” we have now. “Fake Love” was quite depressing. It wasn’t what we could pull off in the beginning. With the guitar sound now, it becomes the “Fake Love” that we could pull off. I think this is the “Fake Love” for us. And it’s much better for performance, too. […]

When we heard it was going up 6 and a half pitches, I was really shocked. Six and a half pitches. I thought about rewriting the rap part because pitches are important for rap as well. There are pitches and melody for rap as well. So if the pitch goes up, then it’s a different rap. And sometimes I can’t do the rap with my voice. But I divided the part with Jungkook, and it turned out very well. The end."