Who knows Jiyoon will baby sit a newborn baby,called Jesper. The girl must feel desperate after her beloved sister pass away in the middle of maternity. And that incident brought her to meet Kim Young Kwang, the doctor and also Yoon Doo Joon, the heir of Yoon Corp. Without her concern, she started to love both of them.

She is Jeon Jiyoon, a young girl with passion in music, a bold and tough girl. She never have a boy before. But she is happy to see her sister married and have baby. She acted tough to get away from troubles and to protect her sister.

Kim Young Kwang, a young doctor. Already a professor. Jiyoon's first love. He is the kindest man, that Jiyoon ever met. He helped Jiyoon's sister on labor, and also Jiyoon's sister's best best friend.

Yoon Doo Joon, the heir of Yoon Corp. Own a famous restaurant in Korea. Left Korea since 2011 until he came back to find Jiyoon. Engaged to Heo Gayoon. A good uncle.

Heo Ga Yoon, a pretty girl. Heiress of Heo Corp. Engaged to Yoon Doo Joon, became friend with Jiyoon, after Doo Joon introduced them.

Jesper Jeon, 3 years old baby. He is the nephew of Jiyoon but then called her eomma all the time. His favorite appa is Young Kwang appa. He doesn't like Gayoon because sometimes she is scary.

Minor cast:

Baek Yerin, pretty young girl. Jiyoon's lovely niece. She came to Korea to meet her cousin, Jesper.

Kim Yugyeom, Kim Young Kwang's brother. Came to Korea after 15 years in U.S.A, He met Yerin at airport.

Nam Ji Hyun, Jiyoon's half blood sister. Jesper's biological mother.