Fifteen years ago, the Lu sisters witnessed their father being murdered at home, but fortunately they hid in time to avoid the disaster. Their father's death was disguised as suicide by their partner Zhao Wendong, and the company fell into his hands. The two sisters vowed to find out the truth and defend their father. Not wanting her sister Lu Xi to be in danger, the elder sister Lu Si decided to investigate alone, but she didn't know that her sister was already involved. The two sisters gradually approached the truth with different investigation directions, and at the same time their emotional life also encountered huge challenges...