Raised under the oppression of a patriarchal household, Gamin marries a client's employee against her father's wishes. However, just two months into their marriage, her husband dies in a car accident—along with his 'legal spouse.' Overnight, Gamin finds herself a victim of a fraudulent marriage and branded an adulteress. To bury the pain, she becomes an accountant and decides to start fresh in a rural town. But there, she frequently witnesses 'office affairs' and begins to be drawn into that world. She falls into a risky, passionate affair with her boss, Jungeun, who has also experienced a failed marriage. In this relationship, free from commitment and obligations, where they keep a certain distance and enjoy only a physical bond—perhaps this relationship, which cannot be spoken of to others, is the most 'safe relationship' of all?
