Why did Yang Runxin name his balls?

Yang Runxin's nickname is "Egg" because he looks very cute, with big eyes and oval face, which looks like a lovely egg, so his master Simba gave him this lovely nickname. Yang Runxin is a costume anchor on the platform of Aauto Quicker, and also an apprentice of Simba, and he is highly valued and expected by Simba.