Crong and Pororo are visiting Tongtong. While fooling around, Pororo bumps into a tree and a caterpillar ‘plops’ onto his face! Tongtong puts the caterpillar on Crong’s hand. He tells them that it’s a tree-dwelling caterpillar. Unlike Pororo, Crong thinks the wriggly bug is really cute. They decide to bring it home with them. Taking Tongtong’s advice, Crong and Pororo pick a bunch of leaves for their new friend, but it’s their first time raising a caterpillar and it’s not as easy as they thought.