Former top powerhouse Chen Yundong, after returning to the city, depends on his younger sister for mutual support; later he is forced to become a female CEO's personal bodyguard; afterwards he successively displays startling skills, making the proud female CEO gradually fall in love. At this time a street incident unexpectedly drags up the hidden past events of his parents back then. A man with super combat effectiveness and fluent in multiple languages, why is he willing to stoop to being a bodyguard? What secret is his past really hiding?