Lan Zhan (蓝湛, Lán Zhàn), courtesy name Lan Wangji (蓝忘机, Lán Wàngjī) is the second young master of the Gusu Lan Clan. Titled as Hanguang-Jun (含光君, Hánguāng-jūn), Lan Wangji is one of the Twin Jades of Lan, alongside his older brother, Lan Xichen. He is the younger child and son of Qingheng-Jun and Madam Lan, the martial brother-in-law of Jiang Yanli and Jiang Cheng, and the son-in-law of Wei Changze and Cangse Sanren, as well as the martial nephew-in-law of Jiang Fengmian, Yanling Daoren, and Xiao Xingchen.