Three years ago, Chen Fusheng was ordered to carry out a mission overseas and became a legend in the international mercenary world. Three years later, he returns to China to investigate the affairs of the Nanshan Society and becomes Chu Yan's personal bodyguard. As they match wits and battle against the Nanshan Society, Chen Fusheng and Chu Yan gradually fall for each other. In the end, they foil the Nanshan Society's conspiracy, protect national assets, and confess their feelings for each other, finally getting together.