Growing up in a patriarchal household, Gamin ends up marrying a client’s employee against her father's wishes. Yet, just two months after their wedding, her husband tragically passes away in a car accident—along with his 'legal spouse.' Suddenly, Gamin finds herself labeled as a victim of a fraudulent marriage and accused of being an adulteress. To escape her sorrow, she takes a job as an accountant and chooses to start anew in a rural area. However, there, she often observes 'office affairs' and begins to get pulled into that lifestyle. She becomes involved in a dangerous, passionate affair with her boss, Jungeun, who has also endured a failed marriage. In this relationship, devoid of commitments and responsibilities, where they maintain a certain distance and indulge only in a physical connection—could it be that this bond, which must remain unspoken to others, is the most 'safe relationship' of all?