The ten girls come to 825 Entertainment, ready to become idols. But Shin Hyuk announces something unexpected. They will be going through a ''mock test'' of sorts, and the girls have just one week to prepare! They only met yesterday; how are they supposed to become a team?

The girls are up for an unexpected dance battle, and the loser cleans the dance studio. Su Ji shocks the girls as she feels the rhythm and dances her best. She is a bit rough around the edges, but Young Joo notices that Su Ji has talent, causing feelings of jealousy and tension to sprout.