Heir Gu Won cannot stand fake smiles. When he meets Cheon Sa-rang, her sincere smile is at the ready. The pair seek to create happy moments where they can smile brightly at each other. King the Land is a VVIP business lounge, a paradise catering to wealthy hoteliers. It is owned by King Group, with hotels, distribution companies, and an airline in its portfolio. Now, Won has been thrown into an inheritance tug-of-war. With his brilliant mind, innate grace, and captivating charm, he has everything but lacks common sense when dating. Sa-rang makes the world brighter with just her smile. She is thrilled to land a job at the King Hotel, where she had some of her happiest times as a child. She must now put those sweet memories away and mature quickly to face the frequent workplace prejudices and misunderstandings that come her way.