At a recruitment for an exercise routine, organizers finally secure a hesitant participant when a teenage boy greets an older woman and awkwardly says, 'I'll call you Noona.' Joo Ah-in and others gasp when someone reveals he's seventeen — 'This is a crime' — and worry he might cause trouble or make someone fall in love. Playful reactions sour: peers insult his weight, he lashes out with threats, and crude taunts about being hit by 'a piece of fat' escalate. An instructor snaps, ordering better manners before exercises. The episode ends with a bystander's question, 'Is she a bulldozer?' — confrontation pending.