Princess Nancheng was the eldest princess of the Chong Kingdom, but because her mother was eventually executed for treason, she grew up in the cold palace as the daughter of a sinner. She has been looking for a way to escape from the prison until she met the man who strayed into the path. Nancheng grabbed this opportunity tightly, but she did not expect that the consequences would be far heavier than she imagined. She finally walked out of that door with the blood and tears of losing her lover, and a new life, a new way of living, a new opposite sex, a new identity, and a new love were all placed in front of her. She had to take every step, calculate, plan, make choices, and whether she should give herself a new chance of love. Whether Nancheng can usher in his own era after getting out of the prison, everything is like a flower and the moon in the fog, hazy and unclear.