After the Chu family was murdered, twin sisters were separated. The younger, Chu Yihe, raised by a boxing champion, became a gifted fighter but worked incognito as a cleaner. When she defended a gym, she was mistaken for a thug by Shen Shiyi, sparking a rocky relationship. To investigate her parents' deaths, she impersonated her delicate sister, with Shen Shiyi guarding her. Together, they uncovered the truth and rose to power.