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Park Dong Hun is a middle-aged engineer who is married to attorney Kang Yun Hui. However, his life is not that happy as he has two unemployed brothers, Sang Hun and Gi Hun, who rely on him. Moreover, his wife is secretly having an affair with CEO Do Jun Yeong, his current boss and college junior. Receiving an unexpected bribe one day, Dong Hun notices that his co-worker Lee Ji An witnessed the incident. Ji An is a young part-time worker at Dong Hun's company who is drowning in debt and left alone to take care of her ill grandmother. Dong Hun then gets entangled in his brothers' struggle to get back on their feet and the company's internal rivalry between the company's CEO and the people opposing him. All the while unaware that CEO Jun Yeong wants to get rid of him and that Ji An is working for him.