Mark and Donghyuck belong to rival high schools and they hate each other's guts — they're not even subtle about this statement. They think the universe must be playing a joke on them when they end up in the same university auditioning for the same volleyball team.

Mark is a forgetful mess and he's sure he would lose his head if it wasn't glued to his neck (and if Donghyuck wasn't there to save the day).