A grandson of Senior Yoon and Junghye's nephew, who wishes to be a star.
"My dream is to be a famous star in nation. That's why I came back!"
A grandson of Senior Yoon and Junghye's nephew.
Yoon Sungil moved to the U.S. for educational purpose when he was in middle school, but came back to Korea where his grandfather stays who loved him so much.
Yet, when he is back, his grandfather is not like he used to be.
So, Sungil starts working as a janitor of grandfather's building to please him.
However, even before he gains his grandfather’s trust, he has a crush on someone.