1x22 - Sister's Slam Dunk

The members meet up with athlete Kim Yeon-koung, who stated her dream to be a rapper. Due to only having a week to prepare, they will be aided by "teachers", which is revealed to be Lee Sang-min (former member of Roo'ra) & rapper DinDin. The members then head out to eat at the restaurant when they began the girl group project and surprise Kim Yeon-koung with the presence of her fellow 2016 Olympic volleyball teammates. The members then try to fulfill her special dream of being a rapper.