Songfacts®:

• "Number One Girl" is a heartbreakingly honest piano ballad that doubles as a window into the fragile human need for validation and the uniquely amplified version of that craving that comes with pop stardom.
• In the opening verse, Rosé's tender vocals suggest she's addressing a lover, but it quickly becomes apparent that the true audience is far broader: an invisible crowd of strangers whose opinions, likes, and comments hold a strangely magnetic power. By the second verse, the curtain lifts, and we see the star as she is, grappling with the isolating, razor-thin line between being adored and being utterly alone.
  
  The chorus captures this duality:
  
  Isn't it lonely?
  I'd do anything to make you want me
  I'd give it all up if you told me that I'd be
  The number one girl in your eyes
• In an interview with i-D, Rosé admitted the inspiration came after a late-night spiral on the internet. "I had been on the internet 'til like 5 a.m. - I couldn't sleep because I was so obsessed with what these people were gonna say about me and what I wanted them to say about me," she recalled. "I was so disgusted at myself for it - I never wanted to admit it to anyone, I didn't even want to admit it to myself. But I had to be fully honest in the studio."
• Honest is putting it mildly. Rosé has described the song as "disgustingly vulnerable," a stark confession of how much she hates this part of herself. "Every word, every comment, it crushes me," she admitted to Paper magazine. The song was her way of pulling the curtain back, even though it made her squirm.
• Co-written and co-produced by Bruno Mars (who also worked on "APT."), the song is bolstered by an all-star team of collaborators, including Amy Allen, Carter Lang, Sir Dylan, Omer Fedi, and D'Mile.
  
  Allen, reflecting on the song's rawness, said, "Being a massive pop star, there's so many things to be constantly juggling and handling, and having your personal life as well - it's [like] a revolving door. I think it's really scary to dig into that sometimes, but the mission statement was always to try and approach it with as much honesty as humanly possible."
• The accompanying music video, directed by Rosé herself, leans into the same vulnerable aesthetic. Set against the quiet, haunting backdrop of an empty Seoul at night, it shows fuzzy footage of Rosé wandering the deserted streets and sitting forlornly in a vacant skate park.