Following her father's murder, a revenge-driven woman puts her trust in a powerful crime boss — and enters the police force under his direction.

Days after a heart-fluttering encounter with a charming man, Yu Na Bi bumps into him again. This time, she's formally introduced to Park Jae Eon.

Ji Sun Woo is a family medicine doctor. She is married to Lee Tae Oh and they have a son. She seems to have everything, including a successful career and a happy family, but she is betrayed by her husband and others. Meanwhile Lee Tae Oh dreams of becoming a famous movie director. He runs an entertainment business with the support of his wife Ji Sun Woo. Even though he loves his wife, Lee Tae Oh falls into a dangerous relationship.

Lee Yool falls off a cliff and nearly dies in an attempted assassination. He loses his memory, and wanders for 100 days under a new name and personality. During this period, he meets Hong Sim, head of the first detective agency in Joseon.

The story of people driven by greed. Kang Pil-Joo grew up at an orphanage, but he now works as a managing director of a legal team at a corporation. He is acknowledged for his intelligence and his exemplary job performance. Some of those that work around him are jealous of him. Na Mo-Hyun is an environmental activist and a science teacher at a middle school. She is a good listener and laughs a lot. She dreams of a love driven by fate.