Street Dance of China 3] EP5 Highlights: Street Dance Boys Open! Huang Bo Takes Center Stage, Jackson Wang Immediately Shouts

This looks like a group presentation in school and they represent different types of student:
Yibo: is the type of student who will make sure to perfect the presentation.
Jackson: the student who adds extra to what the teacher ask.
Wallace: the groupmate who is just having fun.
Lay:the uninterested one but do it anyway 'coz it's required.