Four years ago, Gu Zhaoning was plotted against and saved by Lu Chenzhou, but lost part of her memory due to an accident, thereafter raising her daughter alone. Four years later, Lu Chenzhou concealed his identity as the power holder of a security group and applied to become her bodyguard. In their day-to-day companionship, he discovered that the child he was protecting turned out to be his biological daughter. Facing wealthy family forced marriages and family conspiracies, the two joined hands to investigate the old case and uncover the truth. He protected the mother and daughter, and she also bravely responded to his affection, finally heading towards each other in both directions and bringing a complete conclusion to the fate delayed by four years.