Jeong-hyeon and Yeon-soo meet at a protesting rally in 1991. 20 years into their marriage, Yeon-soo has become a human rights lawyer while Jeong-hyeon stays home looking after their autistic son.

Jeong-hyeon is keen to prevent Yeon-soo from becoming the Chief Corruption Officer in-order to save their marriage. Meanwhile, Yeon-soo begins to investigate a client without knowing the consequences that can happen.

Jeong-hyeon supports Yeon-soo by sticking by her side and assuring her that her choices are right. Meanwhile, Jeong-hyeon opens a letter addressed to Yeon-soo from a dead client.

The news reports of Seung-gu's assault placing Yeon-soo's candidacy as a CCO at risk. Meanwhile, Jeong-hyeon tries to identify those involved through investigating a pollination business.

Yeon-soo faces a crisis at the confirmation hearing and vows to resolve the case when she becomes the CCO. Meanwhile, Jeong-heyon is worried about Yeong-geol's unusual behaviour.

The office of the CCO arrest Chief Kwak Moon-heum, of the Seoul District Prosecutor's office, in an attempt to retrieve the misplaced evidence in 48 hours.