Sister's Slam Dunk

Episode 13 (1x13)

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The members continue to polish their choreography their backup dancers, while also finalizing their outfit concepts. A preview snippet of the final version of the members' song is played by Park Jin-young, before practice resumes. The filming of the music video then commences at a club, with guests, Kim Jun-ho as Min Hyo-rin's boyfriend and You Hee-yeol as Hyo-rin's previous boyfriend.