After a successful twin falls into a coma following a wedding-night accident, her overlooked sister must pose as her to break up with the lover she secretly left behind—only to discover the woman is blind and unaware of the truth.
Ai-oon is the disappointing twin of successful and beloved Ob-oom. They aren't close.
On Ob-oom's wedding night, she takes Ai-oon aside and makes a request of her. Ob-oon and her husband Paul will be going away for their honeymoon and she'll be leaving something important behind: a lover, May, she hasn't broken up with—and she wants Ai-oon to do it for her.
In the early morning following the wedding, Ai-oon learns that the newlyweds got into an accident. Paul has passed away and Ob-oom is in a coma. When Ai-oon decides to fullfil her sister's request, she's shocked to learn that May is both blind and a woman. She finds herself unprepared to complete the task.