Seo Young Ji (Han Ji Hye) was from a poor upbringing and worked as hard as she could to better herself. She went to see a plastic surgeon, hoping that by changing her appearance she would have a better future. The surgeon, a beautfiul young woman called Jeong Ah Mi (Song Seon Mi), asked SYJ for a favor. JAM had been set up on a blind date with Kim Jun Woo (Kim Suk Hoon), but she really had no interest in going. So she asked SYJ to go under false pretense. SYJ agreed to help out with the intention to turn the guy off but the blind date was a hit and the two started dating. Add to the equation Choi Do Kyeong (Kwon Oh Joong), a poor but ambitious social climber, who would do anything to marry rich. He rejected SYJ as she was poor and did his best to go after JAM. Secret Lovers addresses the most important questions of all - is love reason enough to marry someone, or should you be looking for an equal in both social status and knowledge?

Song Ok Sook's husband walked out their family after his business went bankrupt. For the past 15 years she has raised her three daughters up to the best of her abilities. Her husband comes back into their lives and acts as if nothing's happened. To make matters worst, her eldest daughter, Ji Won, who is a doctor, tells her that she wants to marry Sung Soo, a man who she doesn't like.

Kai Ying Tai is the heir of a wealthy family. His dream is to become a famous writer, but such a career path does not correspond with his father. Ying Tai leaves home in order to pursue his dreams. Looking for inspiration for a new book, the boy meets Huai Zhen, who by mistake accuses him of murder. Ying Tai decides to take revenge on it and use it as a major theme of his book, provoking various events. That is, until, when his heart starts to pound for Huai Zhen. Which turns out to be stronger - love or dreams for the release of the book?

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Choi Go is a young aspiring idol working a part-time job, who can be a bit of a coward. Mi Rae, recently hired by a company in the talent development field. The two struggle attempting to start different careers, meet by chance and start to share the same house, but because of their different schedules (one works during day, the other during night), they communicate leaving messages on a board.

Nina is a famous "mor lum" singer who on an unfortunate day discovers that she is a "Krasue". Together with the help of her lover, Nina then embarks on the journey to undo the curse.

Eun Ho Won (Go Ah Sung) faces repeat rejections in her job search until despair drives her to attempt suicide. At the hospital, she learns she might be terminally-ill, but then at the same time, she also finally succeeds in getting hired. Thinking she has nothing to lose, she tackles her job and life with new perspectives. Seo Woo Jin (Ha Suk Jin) is her superior at work and considers her a pain in the neck. They become a bickering pair.