Shenghua Group is facing one crisis after another when its president, Gu Qingyao, unexpectedly hires Lu Chenzhou, a seemingly ordinary bodyguard. What she doesn't know is that this mysterious man is not only hiding his true identity but is also connected to the truth behind her older brother Gu Mingchuan's death three years ago. An insider mole, a power struggle, and the Black Crow conspiracy soon erupt one after another. As life-and-death crises and fractures of trust test them repeatedly, the two join forces to fight back. When the layers of his hidden identity are finally uncovered, Gu Qingyao discovers that the man she should have guarded against the most has become the one she most wants to keep by her side.