Yook sungjae 22 years old is the one and only heir to Y company one of big corporate company in south korea. He now working in the company as his father secretary and preparing to succeed the company. Yook sungjae is a playful man that have many friends and he is popular with woman.One day in his apartment sitting one pretty girl with many bag of luggage that he doesn't know who. Who is that girl? What is her purpose?

Park Sooyoung 21 years old is a tomboy girl and is the heir of Park cosmetic company, the biggest cosmetic company in south korea. She is nice and friendly that she has many fans there. One day her parents ask them to move out to an apartment but when she just arrived, there is one charming man just came out from the bedroom. Who is that man? What happening in her apartment?