"Happiness... is complicated." Life with her sincere and kind husband was warm and pleasant at first, but as time passed, it gradually became nothing more than routine. From the beginning of their marriage, physical intimacy with her husband had been scarce, leaving an unfillable emotional void. Her heart couldn't lie. Burdened with inner turmoil, she confronts her true self and eventually lies to her husband, leaving on a trip. On this long-awaited journey, she meets a man for the first time and is taken by him—amidst the mingled sensations of guilt and pleasure, a new emotion begins to stir.