She is a resident doctor in seoul general hospital, 3 years ago on the day she take oath as doctor, she made a swear to herself not to fall in love with any patient no mater how handsome or rich the person is. But the oath taken toll on her when she attend a singer who almost died, he survived but he lost faith in his life when he being confirmed blind. She stood by him, help him with the new environment and they grew closer. Silently they fall in love, but she is engaged to someone, thats what she keep telling herself and ignore all the sign shown by him. As their relationship go stronger and deeper, he found an matching eyes for himself. 

"Will you be here when I open my eyes?"

"I will."

She make a promise to him, even she know she never able to attend since it is her wedding day so she make her friend send her wedding card to him as her replace.

"Hyung, I rather be blind if that make sooyoung stay with me."