In a livestream by RM, he said:

This is a great song. “Epiphany”. This is the only song I wasn’t involved in.

Jin is interested in composing. He worked hard to make a melody for this song. Jin fixed his melody a few days before we finalized this song, but our producer worked with a composer and came up with a new melody. So, it was changed. I’m curious about Jin’s original melody.

When I first heard it [the final track] I texted Jin like, “This song is amazing!”. I liked it so much. This track is special […] because it’s the only song that talks about “結”, “the conclusion”. There are two songs about “起”, “beginning”, two about “承”, “development”, and two describe “轉”, “turn”, in this album. Jin is the only one who talks about “結”, “conclusion”. There’s only one observer of us in the BTS universe since “화양연화 (The Most Beautiful Moment In Life)”. It is Jin. In that regard, this song is also in the same vein.

The lyrics are so beautiful. “I’m the one I should love in this world, "빛나는 나를 소중한 내 영혼을” (“Shining me, precious soul of mine”). When I hear this song, I become emotional. It sounds like the truth. “좀 부족해도 너무 아름다운 걸” (“Not so perfect but so beautiful”). “하지만 이대로의 내가 곧 나인 걸” (“But this is me”).

It’s hard to admit that. When we look into a mirror, or when we do what we want to do – whether it’s studying at school or following a dream – we sometimes feel inferior to others, or we [think we] lack something. We turn a blind eye to ourselves. But, this is me. […] I’m talking to you. It’s me. I don’t want to deny myself. I need to admit to myself. The lyrics of “Epiphany” tell us to do so.

This type of song sounds perfect. When we make a title track, a lot of people work together. This person writes one part, that one writes the chorus part. This can be a way of making unique and interesting songs. If one person is in charge of songwriting and lyrics, it has a special power. It’s very powerful. I think Jin understood this song well. He was challenged to compose a song and write lyrics.

From this album, Love Yourself 結 ‘Answer’, this is the only and precious song for the “conclusion” part. Jin is the only one who can do this. [It’s] track that earns applause at the concert. It’s “Epiphany”.