In the 1920s, the police chief Lin Aodong was shot and killed, and his adopted daughter Lin Jiuge (Ju Jingyi) was accused of being the murderer and was imprisoned. Jiuge had a hard time surviving in prison. On the one hand, she had to deal with all kinds of female prisoners and grow up in the game with them; on the other hand, she had to deal with the black hands that reached into the prison. Under the threat of death, she raced against time, escaped from prison, and cleared her name. Since Jiuge was imprisoned, the policeman Long Tianyu (Yan Yalun) has been investigating the truth. In the end, Jiuge relied on her wisdom and skills, and with the help of Long Tianyu and Xiao Linfeng, a man who was a policeman and a gangster but loved her at the same time, she got rid of the shackles of freedom. Not only did she successfully clear her father and herself, but she also took down the dark forces that had been entrenched in Shanggu for many years, creating a female legend in the 1920s.