Zheng Jiuyuan

Zheng Jiuyuan (played by Song Jiang) in "A Date with the Devil" I. Basic Identity - A demon who has lived for over 200 years, ostensibly an acting director of the Fairy Moon Consortium, a perfect elite with deadly charm. - They maintain their immortality and divine power by signing soul contracts with humans (fulfilling their wishes → collecting their souls upon expiration); if they do not sign a contract or lose their power, they will spontaneously combust and perish. - Former names: One Yuan, Two Yuan... Current name: Nine Yuan. II. Abilities and Weaknesses - ✅ Divine Powers: Superhuman physical abilities, self-healing, teleportation, telekinesis, and immortality. - ✅ Mark: The demon mark on the left hand is a cross, which is the core of power. - ❌ Weakness: Fear of fire; loses divine power, weakens rapidly, and is on the verge of spontaneous combustion after the mark is transferred. - ❌ Life Extension: You must touch Du Xi (hold hands/hug/kiss) to temporarily restore your divine power. III. Personality and Transformation - Early stage: Cold and arrogant, sarcastic and narcissistic, looking down on humanity, regarding humans as ants, and enjoying immortality. - Later: After meeting Xi, he gradually softens, learns to love, grieve, and sacrifice, and transforms from a "soul-harvesting demon" into her exclusive guardian, willing to give up immortality for her. IV. Predestined Fate - In his previous life, he was a human named Li Shan. Because his lover Yue Xin (Du Dao Xi's previous life) died tragically, his resentment transformed into the demon Zheng Jiu Yuan. - Du Daoxi and Du Daoxi are entangled by fate for 200 years. The transfer of marks and the failure of abilities are all due to the pull of destiny. V. Core Plotline - The mark was accidentally transferred to Du Xi's wrist, turning her into a "fallen demon". - She signed a contract with Du Daoxi: he would protect her safety, and she would help him find his mark; later, they married in order to inherit his estate. - From being bound by interests to falling in love, they fight together against family conspiracies and a curse from a past life.