Yoon Tae-In (Lee Jun-Young) is the leader of idol group Luna. He suffers from sleep walking. To cure his ailment secretly, a fake doctor begins to live with him.

In Yoon-Joo (Jung In-Sun) works as a tour guide. Her dream is to one day buy her own house. She happens to get involved in an incident and begins to live as a fake doctor with the 5 members of Luna: Yoon Tae-In, Lee Shin (JR), Kim Yoo-Chan (Yoon Ji-Sung), Woo Ga-On (Kim Dong-Hyun) and Seo Woo-Yeon (Jang Dong-Joo).

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