Kim Hyun Joon is an assassin who belongs to a top secret organization known as the "NSS" whereas T.O.P is an assassin who works in another secret organization located in the United States called "IRIS" and was ordered to kill Hyun Joon. Seung Hee is a psychological analyst who plays an important role in bring Hyun Joon into the "NSS." Jin Sa Woo is Hyun Joon's enemy and falls in love with Seung Hee as well.

Lee Min Jung is a the daughter of a chaebol family, however, their financial status declines and they are forced to move in with their longtime chauffeur's (Choi Bool Am) family. The once rich and spoiled daughter must learn how to adapt and live as a commoner.

A story about the behind-the-scenes life of an idol group.

Han Sang Eun moved to Australia when she was a teenager. Years later she goes back to Korea with her American boyfriend. Her family, however, has their hopes set on her marrying a nice, Korean boy. They do everything in their power to make her fall in love with Kim Yeo Joon.

This drama tells the story of a woman who devoted her life to love and a man who had never known nor believed in love. Jang Soo Hyun was a woman who previously believed in sacrificing herself for love, even donating her liver to save her first love, Choi Min Young, but was rewarded by betrayal when her best friend, Oh Sun Ah, seduced Min Young. Since then, she had become jaded and resolved to distance herself from relationships, until she met Han Tae Woo, a man who had built a wall around his heart in fear of being hurt again. She becomes someone whom he learns to sacrifice everything for.

A story about the love and married life of six married couples who are pigeonholed into six types of marital relationships!

Shin Se Kyung and Shin Shin Ae (Seo Shin Ae) are a pair of sisters who came to work as maids in Foodstuff company President, Lee Sun Jae's house after their debt-ridden father 'Shin Dal Ho' (Jung Seok Yong) runs away leaving them to fend for themselves. Due to the sisters living their lives in the mountains, everything in the city (outside world) are both new and curious for them specially for the younger sister 'Shin Ae'. Living together with President Lee are his daughter 'Lee Hyun Kyung', Son in-law 'Jung Bo Suk', Doctor to-be son 'Lee Ji Hun', grandson 'Jung Jun Hyuk' who is a highschool student and grand-daughter 'Jung Hae Ri'. Jun Hyuk's school deen 'Kim Ja Ok' is in love with President Lee who is widowed.