A music professor seeking an apprentice sends a young prodigy to his wife for evaluation, unaware of the chord they are about to strike.
Hye-won, a woman who seems to have it all, auditions Sun-jae. His talent enthralls her, as does his passion -- a quality lacking in her own life.
To attend Seohan University as a piano major, Sun-jae works hard to prepare for the school's challenging entrance exam.
When Sun-jae gets thrown in jail for attempted assault, Da-mi seeks Hye-won's help to set him free.
As Joon-hyung readies Sun-jae for his audition, Hye-won struggles with her feelings about the two men.
Hye-won does everything in her power to establish a professional relationship with Sun-jae, but she can't shake her feelings of attraction.
As Hye-won and Sun-jae gravitate toward each other, Joon-hyung begins to sense what's growing between them -- and it doesn't sit well with him.
After spotting Sun-jae having dinner with Da-mi at a restaurant, Hye-won has trouble controlling her emotions and punishes him for her jealousy.
As intimacy steadily builds between Sun-jae and Hye-won, she's appointed as Sun-jae's official instructor.
Sun-jae delivers his most important performance. Meanwhile, Hye-won gets entangled in a mess when her boss is accused of illegal financial activity.
When Hye-won receives a disturbing text message from an anonymous source, she tries to put some distance between herself and Sun-jae.
While Joon-hyung pressures Hye-won to end her liaison with Sun-jae, the young pianist explores the possibility of studying abroad.
As Hye-won's legal problems escalate, she struggles to set her messy relationship with Sun-jae on a less complicated course.
Though Hye-won pretends that she and Joon-hyung are happily married, her struggle to maintain the illusion grows more and more difficult.
As her legal battle intensifies, Hye-won comes up with a plan to get some leverage and put her adversaries at a disadvantage.
Hye-won reaches a crossroads, forcing her to make a decision that will determine the course of her life for many years to come.