Zhang Xuan (张悬) is the main character of Library of Heaven's Path. He was an ordinary librarian of a high school in modern Earth before he died in a fire and transcended to another world. He took over the body of a teacher called Zhang Xuan, the most pathetic teacher in the entire Hongtian Academy. He currently is the Zhang Clan Patriarch, the Sanctum of Sages Sanctum Head, and the Hongyuan Master Teacher Academy Principal. He is also a 9-star Master Teacher and a former 5-star Celestial Master Teacher.