Mu Bai

Personality
He is known to have competitive attitude, wanna be seen as the best among those who are similar age as him, on the early chapters of manga he felt disdainful towards Mo Fan whom he considered as his rival along with Xu Zhaoting.

Summary
During the calamity of Bo City, he helped Mo Fan and fellow students defeat dark beast monsters of Black Vatican.

He shows up when Mo Fan visits the Ancient Capital. They seem to have forgotten high school rivalry and work together when the undead of the Ancient Capital sieges the city.

For some reason he doesn't participate in World College Tournament, it is said that he went out venturing a territory of demon creatures seeking for something to improve his cultivation.

He appears after the tournament story arc when Mo Fan set out for Alps Institute in Switzerland(he also met adopted sister Yan Qiu) and then going on some other adventures with Mo Fan.

At some point he got gravely injured by Spectre and encased in a ice coffin, and was taken away by a Japanese woman who works as a researcher with Undead element. Mo Fan and friends managed to learn a way to wake him up from his comatose-like situation, by finding a gem called Night Amethyst.

Later on, gets revived by his friends using Night Amethyst. (Chapter 2121)

When Spectre tries to kill him later in the story Mu Bai is able to kill him, also confirming the heart-breaking truth that Yan Qiu is affiliated with Black Vatican. (Chapter 2172)

He follows Mo Fan and Zhao Manyan to the Aorus Sacred Institute to investigate the Black Vatican and the frenzied poppies. They diguise as lecturers. Mu Bai uses the alias "Mu Han".