Min-joon is living two different lives. He is a promising architect during the
daytime but at night, he is a Casanova whose technique and expertise are
beyond anyone's imagination. One day, however, he comes across Ji-won
who presents a real challenge to his prowess.

Ji-won is a private banker. She has never lost in her work or in the game of
love for the 27 years of her life. Now she has a chance to make another
notch in her roster of men who have submitted to her.

Until the end of the movie, nobody can guess who's going to be the winner
in this game.