Zhang Yinchen and Zhang Yinxi are sisters who are 5 years apart. After Yinxi is attacked and goes missing overseas, Yinchen takes over Yinxi's all-female bodyguard company SHERO. Together with Yue Ruixiang, the CEO of ship-building company RSB, Yinchen investigates the truth behind Yinxi's disappearance. As they get closer to the truth, it seems like the mastermind is someone amongst them.