Why did Li Shiyuan die?

Zhongyuan is a character in the comic book Shi Li. In the finale, Zhongyuan sacrificed to protect Shili.

The online cartoon "Shi Li" is adapted from the online novel "Huang Lishi" created by Shi Yang and produced by Shimei Film Industry. It tells the story of an ordinary young man, Xiao Nanzhu, who came back to his hometown and accidentally inherited a magic weapon called "Gan" left by his grandmother and her former occupation-Shi Li. Through Gankun calendar, the calendar gods transformed from traditional festivals appeared in front of him: New Year's Eve, New Year's Eve, Lantern Festival, etc ... to drive away evil spirits and defend the human world. As a calendar teacher, Xiao Nanzhu, after understanding the harm of evil spirits to human beings and his own responsibility, chose to join hands with calendar gods to fight against all kinds of evil spirits.