The song "J." by Ivan Cornejo is about a past relationship which failed. He expresses his love and devotion for her, stating that he was always there for her when she needed him and that he was the first person to truly love her. He also expresses his anger towards the man who is currently with her, wanting him to treat her with respect. The chorus repeats that he still sees her everywhere he goes and that his love for her is like fire, never ending. The song ends with the man expressing his desire to start another chapter with her and his sadness that it is impossible. Despite their separation, the male singer's love for his ex-girlfriend remains as strong as ever. The title "J." may refer to the initial of the ex-girlfriend's name, or it could be symbolic of the journey their relationship took.

Ivan Cornejo (born in 2004 in Riverside, California), is an American regional Mexican music singer-songwriter. Cornejo endured a breakup in middle school that provided inspiration for songwriting. He taught himself how to play the guitar by watching tutorials on YouTube. His single "Está Dañada", went viral on TikTok in September 2021. His second studio album Dañado, debuted and peaked at number one on the Regional Mexican Albums chart in the week ending June 18, 2022. The album sold 8,000 album-equivalent units, with 11.9 million on-demand streams of the album's songs, while it peaked at number four on the Top Latin Albums chart.