The story of the "Ugly Sun Wukong" is not a well-known or canonical part of the traditional Chinese novel "Journey to the West" (西游记). However, if you are referring to a modern retelling or a fan-made story that portrays Sun Wukong as being unattractive, the plot might involve some deviation from the original text.
In the original "Journey to the West," Sun Wukong is depicted as a handsome and powerful monkey king with a golden headband and a red face. He is known for his bravery, intelligence, and magical abilities. The story follows his journey to the West to retrieve Buddhist scriptures, accompanied by Tang Sanzang, a monk, and his two disciples, Pigsy and Sandy.
If you are looking for a fan-made story or a modern interpretation where Sun Wukong is portrayed as unattractive, the plot might involve him facing challenges or prejudices due to his appearance. This could include interactions with other characters who are initially repelled by his looks but come to respect his inner qualities and abilities.
If you have a specific source or context for this story, please provide more details, and I can try to give you a more accurate description.