Ji Wook is a cold-blooded detective who would brutally assault and stop at nothing to catch criminals. However, despite his perfectly masculine appearance, Ji Wook struggles with a secret desire to be a woman. At last, he decides to get a sex change. However, a gang Ji Wook had brutally arrested by force plots revenge against him. While he resigns and secretly dreams of transforming into a real woman, people close to him get caught up in a conspiracy and killed. When the one person he must protect, ‘Jang Mi’, also falls in danger, Ji Wook faces a crossroads in making his choice.