This is a possible concise summary:
Q, a member of THE BOYZ, teaches three dance moves from their song D.D.D to four young children with the help of his fellow members. The children are cute and smart, and they have fun learning the dance moves. They also compete in a Jegichagi game to win drinks and snacks. The teachers praise and encourage the children, and they also show some funny and cool skills. At the end, they review the dance moves and say good bye to each other. Siyul, one of the children, asks his mom if he can stay in the class.
Here are some key facts extracted from the text:
1. Q's DANCE CLASS is a show where Q, a member of THE BOYZ, teaches dance moves to young children with the help of other members.
2. The children are Seoyul, Dojin, Jinwoo, Woojin and Siyul, who are between 5 and 7 years old.
3. The dance moves are from THE BOYZ's song D.D.D and include boxing dance, airplane dance and Jegichagi dance.
4. The teachers and the students have a Jegichagi competition for a drink and a snack. Sunwoo and Siyul win the competition.
5. Siyul and Dojin share their snack with Q and Sangyeon respectively. Siyul also asks his mom if he can stay in the class.