Ji Wook is a cold-blooded detective who would brutally assault and stop at nothing to catch criminals. However, despite looking masculine, Ji Wook struggles with a secret desire to be a woman. When at last, Ji Wook decides to undergo a sex change, a gang, the detective had brutally arrested by force, plots revenge. After resigning and secretly dreaming of physically transforming into a woman, people close to Ji Wook get caught up in a conspiracy and killed. When the one person Ji Wook must protect, Jang Mi, also falls in danger, a choice must be made.