As the director of her father's advertising company, Ma Yoo Hee (Han Ga In) is known as a witch for her ruthless, no nonsense character. After a string of failed attempts to hire a housekeeper, she (literally) runs into Chae Moo Ryong (Jae Hee), ex-medical student turned aspiring chef. As a way to work off his debt for crashing into her car, he agrees to become her housekeeper and personal love affairs coach for one month. Gladly, he gives her a makeover that attracts both her old friend Johnny Kruger (Dennis Oh) and her first love Joon Ha (Kim Jeong Hoon). Despite having a girlfriend, Sung Mi (Jun Hye Bin), Moo Ryong eventually finds himself falling for Yoo Hee.

Nam Sang-mi plays widowed police officer Lee Sun-ae who finds herself suddenly immersed into international espionage by Han Yoo-il (Dennis Oh), an undercover agent. Lee Joo-hyun plays Kang-Jun, who's recently transferred to the Criminal Investigation Department. He opens an old case involving Sun-ae's past that leads him to an entanglement between the current political/economic powers and their secrets. One of them, oddly enough, being Han Yoo-il. Who is this man? Why is he here?