Lan Wangji is a prominent character from the Chinese web novel Mo Dao Zu Shi, also known as Grandmaster of Demonic Cultivation. He is a member of the Lan Clan, known for their strict adherence to rules and high moral standards. Lan Wangji is recognized for his exceptional skills in cultivation and his mastery of the guqin, a traditional Chinese string instrument. Lan Wangji is characterized by his calm demeanor, loyalty, and strong sense of justice. He often serves as a foil to his close friend, Wei Wuxian, who embodies a more carefree and rebellious spirit. Their contrasting personalities play a significant role in the story's development and themes of friendship and morality.