Ryu Sang Hye(21) is a college medical student who originally dreamt to become an idol but decided to pursue a medical course due to family issues. Her family is not poor nor very rich but has a very prominent hereditary diseases. Luckily, she's the only person in the family that didn't inherit any diseases. She gained a lot of knowledge about health because of this. But when her father's business started to degrade, she decided to skip one semester and do a part time job. A family friend offered her mom to nurse her only grandson, Kim Min Gyu(18), who happens to dream the same dream as her, to become an idol, but his health doesn't approve of it. Due to certain circumstances, in behalf of her mom, SangHye took the offer instead. 

Building a romantic relationship never crossed SangHye's mind after her first break up she had a year ago but then.. MinGyu starts to make this noona's heart flutter again.