On the September 28 episode of 'Radio Star,' Ga In relayed the story of how peeved she had gotten when Seo In Young didn't use proper honorifics toward Narsha. 

Ga In explained that Narsha had promoted in the past by lowering her age on her profile, leading Seo In Young to mistakenly believe that Narsha was younger than her. Seo In Young recalled, "She was cute so I had dropped my honorifics." 

Ga In, however, wasn't too pleased with Seo In Young's lack of respect towards her "elder." She said, "[Seo In Young] said to Narsha, 'You are so cute.' At first, I was pissed." A surprised Seo In Young turned to Ga In, who was sitting right next to her, and blurted, "You were pissed? You?" 

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Ga In, not wanting to offend Seo In Young, carefully explained, "Even though Narsha told [Seo In Young] that she is older, Seo In Young continued to use informal speech. So I thought the other [Brown Eyed Girls] members would put their foot down but they simply said, 'Yes. We are older.' They were basically afraid of Seo In Young." 

Seo In Young revealed why she dropped formal speech, saying, "If I like someone, then I try to be friendly with them. So this story comes as a bit of a surprise to me. I'm honestly a bit annoyed." 

Just seems like a simple misunderstanding! Seo In Young was just trying to be friendly in her own way and it seems Ga In took in the wrong way. Hopefully, Seo In Young and Brown Eyed Girls are cool now!