Kim Han-Jae is a struggling actor who barely makes ends meet to pay his mother's medical bills. Hanjae doesn't know his father as he left his mom when he was born, and his mother fell ill, diagnosed with amnesia and congestive heart failure. However, when Hanjae decides to disguise himself as the missing Chaebol, Park Jin-Sun, He didn't expect Jinsun's girlfriend, Jang Ga-eul, to see through his facade. Hanjae convinces Gaeul to work with him, but she begrudgingly agrees. Gaeul and Hanjae enter a contract marriage, in which he mustn't fall in love with her, or the contract marriage will dissolve. Thus begins a story of love, trust, commitment, and family. Will Hanjae and Gaeul work through any obstacles that come their way? Or will Gaeul refuse to cooperate?