The Millionaire's Mistress

Young Millionaire Kim Taehyung is in a business and loveless marriage with a Perfume heiress Bae Irene. Two years into their marriage seems like no problem at all. They have this agreement to just go whoemver they want. Until Taehyung's grandfather decided to mess this set-up with wanting a great grandchild with him. This messed Taehyung's life.

Jung Yerin on the other hand is a struggling young woman who is working multiple jobs to bring both ends of the strings meet. She dropped out of college to take care of her sick sister Jung Eunbi.

These two people living in opposite worlds will soon be connected through difficult circumstances.