Park Dong Hoon is a middle-aged engineer who is married to attorney Kang Yoon Hee. However, his life is not that happy as he has two unemployed brothers, Sang Hoon and Gi Hoon, who rely on him. Moreover, his wife is secretly having an affair with CEO Do Joon Yeong, his current boss and college junior.
Receiving an unexpected bribe one day, Dong Hoon notices that his co-worker Lee Ji An witnessedthe incident. Ji An is a young part-time worker at Dong Hoon’s company who is drowning in debt and left alone to take care of her ill grandmother. Dong Hoon 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 Joon Yeong wants to get rid of him and that Ji An is working for him.