Lee Ji Eun, better known as IU, was blind ever since she was born. She lived in a world of darkness and fear. IU's parents passed away long ago when IU was born. Her father was on a business trip, but died when the ship sunk. Her mother was giving birth to IU, but died because of her weak body. Without being able to see, she was afraid and very cautious of her surroundings. She is easily discouraged, which makes her think that being blind and alive 

Siwon and Yoona were the perfect couple you can ever imagine. They always smiled and enjoyed each other's company. Everyone knew this because they never fought or cried because of each other. Nothing can go wrong, right?  Wrong. Everyone was wrong. One day, Siwon dumped Yoona for an unknown reason. After that day, Siwon left without telling anyone where he went. Yoona felt heart-brokened and betrayed, which made h