Yoon Hyun-Woo has worked for the Soonyang conglomerate for more than 10 years. His job mainly involves taking care of the family that runs the company. His job is similar to that of a servant, but he is wrongfully accused of embezzlement by the conglomerate family. He is then killed by their youngest son, Jin Do-Joon. Moments later, Yoon Hyun-Woo finds himself in Jin Do-Joon’s (Song Joong-Ki) body. He plans to take revenge on the Soonyang family and gradually take control of the company. Seo Min Young is an anti-corruption prosecutor working for the Seoul Central District Prosecutor’s Office. Seo Min Young and Jin Do-Joon will become entangled in a relationship that straddles the line between love and hate.