Hwang Tae Hee is the daughter of a chaebol and team leader at her workplace. When Bong Joon Soo and Baek Yeo Jin both begin to work in her team, they become her love interest and troublesome rival respectively. Tae Hee has to juggle her challenges in love with those in work, helping shape her boss and department director, Goo Yong Shik, from an insensitive and uninterested second generation chaebol to a true leader. Tae Hee's seeming success in love, however, presents her with another problem as she begins to realize that marriage involves just as many obstacles to overcome.

This drama is set in Sungkyunkwan University during the Joseon era, revolving around the exploits and love stories of four youths. When her younger brother falls ill, Kim Yoon Hee enters the school in his place disguised as a boy in her desperation to find a way to support him, and becomes friends with Lee Sun Joon, extremely rich and the brains of the gang, playboy Goo Yong Ha and the rebellious Moon Jae Shin.

Kim Kwang Ja is an ordinary 42-year-old housewife who has spent most of years devoted to her gruff husband and indifferent daughter. When she discovers the music of a popular idol boyband, she becomes a fan of the lead rapper, Jin, and finds new joy in her life.

Lee Seung Ki is a man who meets a girl and falls in love with her. The girl is actually a gumiho, a legendary fox with nine tails that eats the livers of humans. When he finds out that she is a gumiho, he ends up doing crazy things to prevent the girl from eating his liver.

Dong Chan is a prickly broadcasting director at MBS who meets and immediately clashes with Nam Hee, a reporter he meets at a wedding reception. Through their constant bickering, they end up falling in love despite their initial dislike of each other. His passiveness in love results in a comedic struggle as the two tries to deal with their physical attraction.

Jeon Jin Ho is a straight guy who pretends to be gay in order to become a roommate to his female friend, Park Kae In. His hobbies include organization and ironing, and he’s known for his stoic poker face. He’s a stickler for cleanliness, but he also has a talent for figuring out women’s feelings. Kae In is very trusting even though she has a habit of being betrayed. However that doesn't stop her from giving people the benefit of doubt and Jin Ho is no different. How will Kae In react when she finds out that her gay roommate is not actually gay at all and that he has fallen for her?