J.Y. Park thrills the students with a new song, while Na-yeon and Da-hyeon from TWICE visit to offer support, but no one knows the story behind his rivalry with Kim Young-chul.
EXO returns after a year away from the classroom and they think they are comedians now.
Transfer students Ji Seok-jin and Park Jeong-a pass notes at school; Ji Seok-jin and the K-wave; Wang-ko dislikes nose jokes.
Football legend Lee Dong-guk rocks the classroom and has a war of nerves with the other athletes in the class, while his young son charms everyone.
Video clips, a surprise guest, and a special performance at the 2019 MoM Awards make for a warm end-of-year bash.
These rising stars shine even brighter in the new year; Kim Hye-yun, Kim Gang-hun, Bo-na of WJSN and Chan-hui and Ro-un of SF9 are dazzling in the classroom.
Kang So-ra, Ahn Jae-hong, Jeon Yeo-been and Kim Sung-oh talk about what brings them to the classroom.
Bae Jung-nam and Choi Yeo-jin usually meet at the gym, but this time they bring their Zumba workout to the classroom.
Jin Seo-yeon and Choi Soo-young turn heads with their bold entrance and daring twist on the school uniform.
Sung-kyu loses his dance moves after two years in the military; Lee Yi-kyung's fame; Kangnam's newlywed life.
Superstar stylist Han Hye-Yeon gives the class a makeover; Heo Ji-woong gives them a lesson with his pointed tongue.
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