20-year-old college student Oh Young-na. While her parents are away on a business trip, who shows up at her empty house is... South Korea's beloved handsome actor, and her father's best friend?!"Has Young-na grown up this much?""Uncle... if my dad finds out, we're in big trouble..."And then, her father's other friends begin visiting the house one after another...A thrilling cohabitation that must never be discovered begins!