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.

幫助與情人May分手，這是雙胞胎妹妹Ob-oom在婚禮當天發生意外之前給雙胞胎姐姐Ai-oon的最後一個請求。但當Ai-oon與May見面時卻發現她是女人且眼睛失明，更要命的是Ai-oon的心隨著May的吻而悸動，這是她從未有過的感覺，這一切讓Ai-oon不敢跟她分手，反而假扮成妹妹向她示愛！但這段愛情並不容易，因為它始於欺騙，Ai-oon和May將如何修復這愛情故事呢？