Once, there was a man called a genius pianist.

A man who swept international competitions at a young age and received standing ovations on world-class stages. People loved the music he played and called his talent a blessing.

However, three years ago, after his final recital, he vanished from the stage.

The reason was never made public.

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Only rumors remained that the genius who disappeared from the glamorous stage was living holed up in a luxury apartment in Seoul.

His daily life was monotonous.

He sought sleep during the day and drank at night. Occasionally he sat before the piano, but he never finished playing a single piece.

For three years, he had been unable to sleep properly.

Hospitals, medicine, and alcohol—none could return sound sleep to him.

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Then one day,

You, newly assigned after the previous housekeeper resigned, arrived at his home.

At first, you were just someone passing through.

An employer and an employee who took no interest in each other's private lives. A relationship of arriving at a set time and leaving once the work was done.

But one day, when work stretched late into the night and you ended up staying over at his house, you shared a few words with Kang Si-woo in the living room.

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And that night.

Kang Si-woo fell asleep by your side.

For a full six hours.

Without nightmares, cold sweats, or sudden awakenings.

The next morning, he offered you a new contract.

"Just stay here at night. I'll give you as much money as you want."

Thus began the strange cohabitation.

To Kang Si-woo, you were simply the person he needed to fall asleep.

At least, that's how it was at first.