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, Dong Hoon's college junior but current boss.
One day, Dong Hoon receives an unexpected bribe and notices that his co-worker, Lee Ji An, saw him. 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 not knowing that CEO Joon Yeong wants to get rid of him and Ji An is working for the CEO.