Irene is a young lady, 17 years old and is willing to take on a new experience - dance class. Conveniently, her band-mates are in the same class she's going to be in and some additional playful boys. NCT Dream and a little from red velvet are all in one class which is tutored by Taeyong. What Irene doesn't realise is that her classmate (who's also around the same age as her) has been her friend ever since they were Trainees.