The animals' skills on the land have been learned by咸菜 (Preserved vegetable) basically. Next, he decided to take fish as his teacher to learn entering the sea and then flying. In this way, he could become a true superman. In "Super Preserved Vegetable Part 8 - Preserved Vegetable and Cat", he grew up in water since childhood. In "Super Preserved Vegetable Part 7 - Preserved Vegetable Farting", after having this smelly skill, Preserved Vegetable dreamed that one day Rose would encounter trouble and ask for his help. One day, he suddenly thought of what impression Rose would have if she saw him in such a smelly state even if he became a superman, so he was very troubled. Anyway, this skill of his is not as convenient as weasel farting. Being familiar with water, he originally thought swimming would be easy to learn. However, when he started learning, he realized that what he did before in the water was just holding his breath and hiding, which was much simpler than swimming. When it came to real swimming, he found that his body was too heavy compared to the fish's body, like a weight. After learning for a long time and still unable to float, the fish no longer wanted to teach him. He himself was also confused about what to do. Then the fish told him that his body was too heavy. If he didn't grow fins like a fish, it would be hard for the fish to teach him. He asked how to grow fins. The fish said that only the witch knew.
Now he had no choice. Who knows where the witch is? He decided to stop learning swimming for now and go learn flying first.