Housewife Miyazawa Tomomi, her husband out of a job, loses her treasured home as her family is forced to do with less during the recession. Her one ray of sunshine is her upcoming middle school class reunion, where she hopes to meet old friends as well as old flames. The class reunion, however, turns out to be more of turning point not only for her but for the others as well. Just how will these four people's lives change after their class reunion...

Kim Jin Seo and Mo Yoon Hee are high school classmates and rivals whose different family backgrounds shaped their characters and their paths towards love and success in adulthood. Jin Seo develops a warm and cheerful personality as well as superior intellectual ability, while Yoon Hee becomes a beautiful woman with fatal charm. Both women love Lee Sang Hyun, an extremely kind but indecisive man who used to date Yoon Hee but later married Jin Seo. When Yoon Hee's husband, Sung Eun Pil, dies under suspicious circumstances, Jin Seo finds herself becoming involved in the investigation. The process is complicated when the young homicide detective Kang Shin Woo becomes romantically interested in Jin Seo.

Xiao Liang (Bi) is the CEO of the world's biggest Diamond company. He's reserved, strict and counts every penny while doing business. He also chooses to close himself off from people, insisting relationships are of no worth in his life. Everything turns upside down when he meets Mi Dou (Tiffany Tang), a woman who changes his views in life and teaches him what it means to be alive and happy.

This trilogy drama is about Gong Seon Hwa (32 years old), a social welfare worker who's getting married to Kang Won Hyung (30 years old), a Korean culinary chef, portrayed by Ji il Joo.

A man, who does not know anything, but in fact, he is the main character, which puts him in absurd situations that makes him suffer. What the hell am I?!

Hee Ram and Ga In met in a general education class, Psychology of Love and Sex class. In this class, students have to perform a dating mission as a mock couple. A hard-working student Hee Ram and an easy-goer Ga In don't quite get along with each other from their first meeting.

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