A young girl who lives with her cruel stepmother and sister, accidentally meets 3 young and rich cousins who live a luxury life in a big mansion and is hired by the boys grandpa to look after their bad behavior.

38-year-old Ha No-Ra (Choi Ji-Woo) dreamed of becoming a dancer when she was younger. She met her future husband, Kim Woo-Cheol, when she was only 19-years-old and became a mother unexpectedly. Since then, she focused on her life as a wife and mother. Ha No-Ra then decides to attend the same university as her 20-year-old son Min-Soo and faces life a second time like a twenty year old. Written by http://asianwiki.com/Second_Time_Twenty_Years_Old