Plastic surgeon Seok Ho and his psychiatrist wife Ye Jin host an evening dinner with their good friends. Tae Soo and his wife Soo Hyun are the first to arrive and are soon joined by Joon Mo and his wife Se Kyung. Lastly, Young Bae arrives late and by himself.
While the good friends enjoy a full-course dinner and alcohol, Ye Jin suggests that they play a game. The game requires everybody to leave their cellphones out on the table. Whatever text messages or phone calls that arrive are then shared with everybody. What secrets will be revealed among these intimate strangers?
Kim Ji Su is a 31-year-old single woman who once wanted to become a famous pianist like Horowitz. Her dream was shattered but she was able to go on by teaching children to play the piano.
One day, she discovers a young boy, Gyung Min, who is a musical genius. She starts to give him intensive music lessons, preparing him for competition, but it does not turn out well. But later, when all seems lost, Ji Su is utterly shocked when she realizes that Gyung Min carries a secret that will change her life forever.