The Original Princess is the eighteen-year-old princess whose body Xin Long now inhabits. She was born to a forgotten consort whose mother died young. She grew up neglected and miserable inside the Cold Palace until she met her imperial brother, the Crown Prince. That single act of kindness became the only warmth in her lonely life, and she fell hopelessly in love with him. The Crown Prince knew her feelings had crossed the line but continually encouraged them. When she turned sixteen, following his instructions, she drugged Xiao Jinghe during a palace banquet, forcing him to break off his engagement and marry her. After marriage, she frequently sneaked back into the palace to meet privately with her imperial brother while Xiao Jinghe was away commanding troops. She conspired with the emperor to destroy Xiao Jinghe's entire family and have them exiled. She was so thrilled by the emperor's empty promises that she suffered a heart attack and died on the way back to the Duke Dingguo's residence.
