Lee Yu-bin released the single 'Bad Thing (Feat. Lael)' featuring Kim Lael.

This song captures the moment of being led by someone else even though you are already by their side, and your heart shaking in front of that person.

The introduction explained that it was a song about the anxiety and conflicting feelings between love and desire in a situation where you know you have to stop but you can't.

Lee Yu-bin composed, arranged, and produced the song and played guitar and bass herself, while Ra-el Kim participated as lyricist, top line, and vocalist.