My name is Chen Nan, an eighteen-year-old boy. I was born with a Yin evil body but inherited the Yang Yang technique from my grandfather. I have double pupils in my left eye (which can see the energy of Yin and Yang), and a cinnabar mole on my wrist (a seal that seals the Yin evil). I was possessed by an evil spirit when I was young. My grandfather spent half his life cultivating to keep him alive, which caused the Yin and Yang energy in the body to be imbalanced all year round.
