15&'s Park Ji Min honestly confessed that she was jealous of Lee Hi.

In an interview with Star News, she revealed, "When I saw Lee Hi unni on TV, I thought, 'Ah, I want to be on that stage, too'. To be honest, right now it's true that I'm a little jealous." The pair had been rivals since 'K-Pop Star', and then had debuted as a JYP Entertainment and a YG Entertainment artist each.

She said, "Even though it's true that I'm jealous, right now I feel more like I want to do better now. I think there will be a time when Lee Hi unni does well, and when we do well. I think it'd be great if we both did well together." On being compared to the other singer, she said, "To be honest, I predicted this from when 'K-Pop Star' ended. No matter how many times we said, 'Please watch the two of us well', nothing helped. To be honest, Lee Hi unni and us don't have anything in common, and we have our own style. I think we'll keep have a good rivalry under the name 15&. YG Entertainment matched Lee Hi unni well, and Lee Hi unni pulled it off well. Since we have a different style this time too, I think people will see us differently. I think the power of the label isn't as important as the artist's ability to pull it off."