Everything goes haywire when a mysterious woman sets her foot into the world where she does not belong. Life has always treated Eun Soo (Choi Kang Hee) the hard way, but she has never complained or looked back and has always forged ahead with her life. Although her husband died being framed for embezzlement and she was imprisoned for a crime she did not commit, Eun Soo's only hope is to raise her 7-year-old daughter as a single mom. However, when she encounters her first love, Hyung Woo (Joo Sang Wook), at the church exchanging secret wedding vows with her childhood friend, Il Joo (Cha Ye Ryun), Eun Soo's life is forever changed. No one has the slightest idea how Eun Soo is going to stir up the order of the world of the wealthy elites, but everyone will come to realize that there is more to Eun Soo than meets the eyes.