The second story of "Adult Trainee" isn't quite self-contained. Or at least, the end of the fourth episode was way more ambiguous than the one at the end of the second episode. But more importantly the story in general is a lot less interesting. Yoo-ra (played by Jo Yoo-jung) is a high school student who's still nursing her pride from a nasty breakup. So for somewhat convoluted reasons, she enlists the aide of her longtime friend Nam-ho (played by Ryeoun) to pretend to be her boyfriend, Adult Trainee, Bang So-min, Jeong Hyeong-geon, Jin Yoon-joo, Jo Yoo-jung, Kim Hyun-min, Kim Min-ki-I, Kwon Young-eun, Miyeon, Ryeoun, Ryu Ui-hyun, Yoo Hak-chan