Karl is a man born from an ordinary family but their family has an element or mark on their own body, and Karl has the Geo element, and has a mark on his back that depicts a dragon when his emotions can no longer be contained or he can no longer hold it back, and Zhongli, the person who helps him to control his elements, and also Karl has a crush on Zhongli, and Karl was born in Liyue, a country led directly by Zhongli. And Karl has friends besides Zhongli, namely Xiao, Chongyun, Xingqiu, and Baizhu. And still Zhongli and Xingqiu are Karl's guinea pigs but it is still Zhongli who if the others are busy Zhongli will be the guinea pig for the results of his experiments.