A homicide squad detective, suspected of serial murder, searches for the real culprit.

Lee Jae-In possesses a good appearance, he is smart and comes from a wealthy family, but he is also arrogant. His grandfather orders Jae-In to enter into a 10 month contract engagement with a female school teacher that he has never met in his life. Lee Jae-In slowly falls in love with her.

Born from a tryst between a nobleman and a slave woman, Hong Eun Jo is no stranger to the plight of the average person, especially after her father fell ill. By day, Eun Jo works as a doctors, but by night, she assumes the identity of "Hong Gil Dong," a thief who steals from corrupt officials to spread wealth among those in need. Hong Gil Dong's antics attract the attention of Prince Yi Yeol, who has a penchant for investigations and is personally intrigued by the mystery of the righteous thief, although most palace officials believe that he's just joking around. Amidst his search, Yi Yeol runs into Eun Jo, falling in love at first sight – but when Yi Yeol and Eun Jo happen to swap bodies, secrets they both try to keep hidden risk getting out.

A notoriously shrewish TV drama writer and a Korean wave star who fight like cats and dogs every time they meet; a spinster flight attendant landlady and a nosy chef tenant who build a sense of camaraderie; a genius relationship-virgin composer who harbors a secret admiration for a scatterbrained producer. As they crash-land into each other's lives, will there be love?

Ace insurance investigator Cha Woo-seok hunts a fraud ring tied to mysterious deaths and becomes dangerously entangled with Han Seol-ah, a flawless art auctioneer whose lovers all seem to die. As attraction and suspicion blur, he must uncover whether she’s a killer or a victim, before the truth costs him his life.