Yi-su’s life has been tough since she lost her parents, growing up isolated in a rural town under her grandmother's care. Now, working diligently at the county office, her primary challenge is dealing with the never-ending stream of difficult and often malicious complainants, leaving her constantly exhausted and drained.

One day, a mysterious and incredibly unsettling man named Yang Tae-oh crashes into her life. From their very first encounter, his bizarre charm and unapologetically vulgar words completely throw Yi-su off balance. He doesn't just annoy her; he challenges everything she knows about polite society. His behavior is magnetic yet alarming.

Tae-oh is not shy about his intentions or his flirtatious, provocative manner, dropping lines like, “I could make a pretty girl faint. Holy… Next time, are we mixing tongues, Sweetie? You’re damn good at flirting.” Yi-su is both horrified and intensely drawn to this dangerous individual who seems to find pleasure in chaos.

Finally daring to ask him who he truly is, Yi-su is shocked but maybe not entirely surprised by his answer: “Me? I’m a gangster.” Follow Yi-su as she navigates her complicated life at the office and her intensely passionate, R-rated relationship with a man who lives on the wrong side of the law.