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?

The relationship of several couples who try to search for the meaning of the word ‘love’ which differ.

Pop and Mo are a young couple, in which the girl has dreams of becoming a steward and air hostess but only the girl, Mo, alone becomes an air hostess in an airline as what she dreamt of. That makes the guy, Pop, have to reluctantly work in the Catering department of the airlineinstead. This is just to be near airplanes, his girlfriend, and the steward profession that he dreams of. He then finds that his definition of love changes when he meets Oat, a trouble making coworker in Catering.

While working he becomes the one that people make fun of. “Necessary wife” is the position that he unhappily becomes because Oat likes to irritate and tease him often. Having to work together makes these two unintentionally become rivals in the workplace. Oat annoys Pop a lot, such that Pop doesn't know what to do with him. But the relationship of this couple progresses from not liking each other's faces to becoming a close firm friendship before they realize it.

At the same time, Mo meets Nick, a handsome pilot trainee of the airline, who is very dedicated to her.

Kim Mu Gil is an old man who during his old days was forced to work in Hiroshima during Japan’s occupation of Korea. Surprisingly one day he receives a letter from his first love Yeo Il Ae. Kim Jae Yoon who is Kim Mu Gil’s granddaughter upon seeing the letter decides to find his grandfather’s first love and she then discovers about their emotional past along the way. The drama will focus on the painful lives of the youth at the times of Japanese occupation of Korea, Korea’s liberation, and the Korean War.

"Crime Puzzle" is a story where a criminal psychologist is sent to prison for murdering a political candidate, and the criminal profiler who loses her father to the murder is conducting interviews with the murderer for a case that occurs within the prison. These two used to be lovers just a year ago, until they meet again as a murderer and a criminal profiler, and face the unexpected truth to a series of murders. The thriller focuses on the process of them putting the pieces together, like a puzzle.

Adapted from the webtoon "Crime Puzzle" (크라임 퍼즐) by Meen.

Ayumi Shinozaki (Shihori Kanjiya) is 33-years-old and works as a librarian. Keisuke Mori (Kanata Hongo) is 23-years-old. He wanted to become a cameraman, but had to give up on that goal. Taro Tendo (Gori) is 40-years-old and divorced. He holds regrets about his son. One day, Ayumi Shinozaki receives a phone call. A man’s voice states "one hour later, an earthquake will occur." One hour later, an earthquake actually takes place. The caller introduces himself to Ayumi Shinozaki as Kazama. He tells her she can go back in time to 10 months ago and change what she wishes. 8 people including Ayumi Shinozaki, Keisuke Mori and Taro Tendo participate, but they face something they did not expect. Under the difficult situation, Ayumi Shinozaki and Keisuke Mori develop feelings for each other.

Xiao Qiang has just undergone a very stressful divorce, she has no faith in love, until she meets a young computer engineer by the name of Bao Jia Ming. He is idealistic, ambitious, and everything she no longer believes she is. The story tells of the two's romance and how they overcome the many obstacles that pave their way.

Habu Seiichi is a member of the mysterious outlaw group Avalanche. The group exists at a time when moral hazards run rampant among politicians, bureaucrats, businesses and even among ordinary people.