It's time for the girls to go to the next karaoke night, and the first song that comes to mind is "Park Hyo Shin," which means "friend." The song's title is a reference to the fact that the girls are close friends, and it's ironic that the song is about friendship. The girls decide that they're going to go first, and when they get to the end of the song, they realize that they haven't been paying attention to the title.