In a new episode of MBC's 'Four Guys One Girl' that aired on February 14, Kim Gu Ra took to washing the dishes while listening to music after having a feast of a breakfast.  At one point SISTAR's "Loving U" came on and A Pink's Eunji heard this from another room.

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She yelled, "You don't even turn on our songs, this is tyranny."  Honey Lee, who was taking care of mother Kim Soon Gwee's skin, sided lightly with Eunji, "What do you think you're doing?" 

Kim Jae Won then came into the picture, taking Kim Gu Ra's cell phone to turn on one of A Pink's songs instead.  However, as he was looking for a song, Kim Gu Ra said, "I don't have any A Pink songs.  Those are the songs I downloaded."

Not giving up, Kim Jae Won said he would turn on another song.  Kim Gu Ra asked why he was doing that as it seemed he had not heard Eunji's words, so Kim Jae Won responded, "Eunji is from A Pink."  However, Kim Gu Ra said bluntly, "Ah, she's asking why I put on SISTAR?  Their songs are not up to SISTAR's standard."

Eunji said, "I heard that!  I won't say that's untrue, but shouldn't you be on my side?" Kim Gu Ra said casually, "You might be good at acting, but when it comes to singing, it's still SISTAR."