"500,000 won per case." "What is it about?" "Whenever I have a blind date, you can come and ruin it for me. Want to do it?" Inah finds herself momentarily trapped in a dilemma due to Se-kyung's outrageous proposal. But that’s just nonsense! The reason lies in her disastrous first encounter with Im Se-kyung. Shaking from the betrayal of her ex-boyfriend, who even cheated on her, Choi Inah finds herself at a club. Vowing never to meet another man again, she drunkenly stumbles into a lesbian club. There, Inah meets a beautiful woman of ambiguous age with whom she connects effortlessly. The two share drinks, and nearly unconscious, Inah follows the woman to a hotel. Thus begins a hot one-night stand with a stranger. It was Inah's first experience in bed. When morning comes, she is horrified by her actions and escapes the hotel as if fleeing. Soon, anger and regret flood in, and she curses the unknown woman who took her first experience, vowing to destroy her if they meet again. They say you meet your enemy on a narrow bridge. The senior, who is a rich kid with stunning beauty and has just returned to school, turns out to be the one-night stand woman. With Choi Inah thoroughly on the defensive and Im Se-kyung persistently making advances, the relationship becomes a clash of spear and shield. How will this relationship end?