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.

Although the man he loves died thirteen years prior to the start of the story, Lan Wangji recognizes Wei Wuxian soon after his resurrection in the body of Mo Xuanyu. Eventually, Lan Wangji and Wei Wuxian acknowledge their feelings for each other and become cultivation partners.