Teenager Lee La-el witnesses the destruction of her family and murder of her father in a hostile takeover orchestrated by Han Pan-ro, a powerful former prime minister. La-el is adopted by Jang Moon-hee, a woman whose daughter was also murdered by Pan-ro. Moon-hee encourages La-el's need for revenge, and the pair prepare to punish Pan-ro and his right-hand man Kim Jeong-chul. Thirteen years later La-el, using the name Kim Sun-bin, has married Jang Ji-wook, who was also involved in Pan-ro's hostile takeover. Using this connection, La-el befriends Han So-ra, Pan-ro's daughter, and initiates an affair with Kang Yoon-gyeom, So-ra's husband. La-el is helped by Seo Eun-pyung, a congressman who was mentored by La-el's father, and who is in love with La-el.