Tang Priest and his disciples went to the Western Heaven to learn Buddhist scriptures, passing through barren hills and fields. The Tang Priest sent the Monkey King to look for melon and fruit food, and Pig Bajie followed. They didn't go far, and Bajie pretended to have a stomachache, so Wukong had to go alone. Bajie was about to fall asleep when he saw a big watermelon under the cliff ahead. He quickly moved it to the shade and cut it into four pieces. I ate my own piece first, and I felt dissatisfied, so I thought of various excuses and ate Wukong, Friar Sand and even Master's watermelons. In order to teach Bajie a lesson, Wukong turned into watermelon skin and followed Bajie all the way back. Watermelon skin deliberately played tricks on Bajie, causing him to fall down. Finally, Bajie had to admit his mistake in front of Master.