Areum becomes a single mother while studying in the US and returns home. And here is a man named Seongwoon who is deeply hurt by his family. One day, Aaron Choi, the biological father of Areum's child shows up in front of them. Seongwoon decides to take care of the child and protects her from Aaron who seems to be busy enjoying his life. "Love & Secret" features these three characters who challenge themselves to succeed in their career, love, and family business.