Retired special operations champion Jiang Lin, in order to rescue and save his younger sister who is held hostage by Shen Tianhao, conceals his sharp edge and applies to be a security guard for the Yun Group, where asking for a sky-high one million annual salary in advance is mocked by everyone. Relying solely on his own strength, he repeatedly rescues female CEO Yun Xi who is plotted against by business rivals, closely protecting her to break through business crises while deeply digging up the monstrous criminal evidence of the Shen family framing his father and imprisoning his sister for twenty years. In the end, Jiang Lin exposes his identity, holds ironclad evidence to overthrow the dark and evil capital, protects his sister and the beloved companion standing shoulder to shoulder, and completes redemption and revenge.