Seo Joohyun lived a normal life until she got hit on the head too hard and fell into the wrong hands. Next thing she knew, she woke up in a room she didn't recognized, not remembering anything that had happened in her life at all. She was greeted by faces she had never seen before. She was told information she couldn't even imagine.

She was told she was a very wealthy woman—wealthy in both material things and happiness. She was married to Cho Kyuhyun, a man of business and strategy working in the family company.

This information included that he was very loving and that they had been happy for a long time together but she had been quite ill for some time. The servants told her she had been hallucinating and that now she had finally come back to her senses.

Not knowing this was a cunning little prank as revenge, she believed every word of it.

Chu Songhee, the mastermind behind this evil plan, pretended to be her sister while she forced her old friend, Henry Lau, to be the brother. And Kyuhyun, always loving pranks, went along with it.

But soon, he regrets it deeply.