Other than Xiao Yan, was there any other person who was the main character of the 'Battle Through the Firmament' series? For example, was there anyone like Xiao Yan who acknowledged Xiao Yan as his master?

Yes, I can recommend two novels: "Dou Po: At the beginning, I took Yao Lao as my master, and Xiao Yan became my follower" and "Dou Po: I laid my cards on the table with Xiao Yan, and he begged me to be his big brother". The former was a story about a transmigrator who became Xiao Yan's brother. He possessed a supporting role system and helped Xiao Yan grow by obtaining a reward from the system. The latter was a story about Hun Tiandi's illegitimate son, Hun Cang, who had transmigrated to Dou Po World and helped him grow by triggering a hot shot item. Although the main characters were all related to Xiao Yan, there were still some differences in the character settings and plots. It was interesting and good to watch! I hope you like this fairy's recommendation. Muah ~😗