Peaceful, artistic member of the Nie clan. He's not great at academics, but loves painting, porn and smuggling canaries into Cloud Recesses. Also known as: Sir Don't Know (for his purposely vague answers). Hidden depths to HuaiSang, though. Keep an eye out for him.
"This was the second young master of the QingheNie Sect - Nie HuaiSang. His brother, Nie MingJue, was extremely resolute when carrying out orders, quite renowned in the cultivation world. Although the brothers were not born from the same mother, their relationship was quite solid. Nie MingJue had always taught his younger brother with extreme harshness, particularly caring for his studies."
Nie Huaisang is the mastermind behind bringing Wei Wuxian back from the dead to avenge the death of Nie Mingjue.