Jiang Cheng, courtesy name Jiang Wanyin, is the current leader of the Yunmeng Jiang Clan and Jin Ling's maternal uncle. He is also known by his title, Sandu Shengshou. He is the younger child and only son of Jiang Fengmian and Yu Ziyuan, Jiang Yanli's younger brother, the brother-in-law of Jin Zixuan, and used to be the younger martial brother of Wei Wuxian before he defected the Yunmeng Jiang Clan. After his sister's death, Jiang Cheng became the guardian of Jin Ling while rebuilding Lotus Pier