Jiang Cheng (江澄, Jiāng Chéng), courtesy name Jiang Wanyin (江晚吟, Jiāng Wǎnyín), is the current leader of the Yunmeng Jiang Clan and Jin Ling's uncle. He is also known by his title, Sandu Shengshou (三毒圣手, Sāndú Shèngshǒu).
The Novel describes Jiang Cheng as exceptionally handsome in a sharp way. His eyebrows are thin, and his almond eyes possess a composed vigor, yet resemble two bolts of lightning when he has the intention to attack. His posture emits an air of arrogance and overconfidence, and he wears the violet jianxiu robes of the Yunmeng Jiang Clan.
Even in his childhood, Jiang Cheng is bad-tempered and often compared to his mother Yu Ziyuan. He cares deeply for his family. Although he often reprimands Wei Wuxian for his antics, he also expresses horror and anger at the idea of Wei Wuxian hurt. In fact, he willingly offers himself to save both Wei Wuxian and, later, his nephew Jin Ling.
Jiang Cheng also possesses a deep inferiority complex about his father Jiang Fengmian's favoritism of Wei Wuxian, and his mother's continued reminders that his cultivation is inferior to Wei Wuxian's. As a result, Jiang Cheng believes that his father does not like him or his personality, and this remains a sore spot well into his adulthood.
Jiang Cheng possesses an awareness of societal values, correctly predicting that society will turn on Wei Wuxian if he continues to protect the remnants of the Qishan Wen Clan. As he cares deeply about his reputation, he often allows injustice in exchange for self-preservation.
After his sister Jiang Yanli's death, Jiang Cheng becomes consumed by vengeance and anger. After Jiang Yanli's last action to protect Wei Wuxian, Jiang Cheng blames him for her death and leads the First Siege of the Burial Mounds against him. He then tortures and kills many who practice Demonic Cultivation out of suspicion that they are actually the returned Wei Wuxian.
Jiang Cheng is a strict guardian to his nephew Jin Ling. He often threatens Jin Ling not to fail and, when angered, threatens to break his legs. Still, he never carries out his threats of violence.
- Jiang Cheng ranked fifth on the list of best-looking young gentlemen in the cultivation world.
- Jiang Cheng went on three blind dates. Due to his behavior, all the female cultivators blacklist him.
- Jiang Cheng's requirements in his partner are: naturally beautiful, graceful and obedient, hard-working and thrifty, coming from a respected family, cultivation level not too high, personality not too strong, not too talkative, voice not too loud and must treat Jin Ling nicely.
- He is the only person in history known to have a transplanted Golden Core.
- Jiang Cheng's name (江澄) and courtesy name Wanyin (江晚吟) are derived from two renowned Tang Dynasty poems: "Jiang Cheng" from Du Mu's "vast clouds and mists entwine the deep forest trees; autumn bathes in the clear river" (云阔烟深树，江澄水浴秋), and "Jiang Wanyin" from Xu Hui's "I wake from a hazy nap in autumn, enshrouded by the fragrant aroma of tea leaves; at dusk I saunter and recite poetry, the pine branches swaying in time" (茶香秋梦后，松韵晚吟时).