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.

This novel-based story revolves mainly around four people who are drawn to Seogwipo, Jeju for a project. Kim Jung Woo and Lee Soo Hyun first met when they were children but lost track of each other for numerous years. Years later when Jung Woo meets Soo Hyun, he falls in love with her but his feelings are not reciprocated. Soo Hyun doesn't realize until much later that she's drawn to Jung Woo as well.

Park Yong Ha portrays man who once had it all. A scam ruined his family and his father's company went bankrupt because of him. He wants revenge against those who made his life a living hell. Park Si Yeon is his girlfriend who works diligently in order to help him repay his debts.

The drama about men who engage in fights and a deep bond develops between them.

Go Ni suffers an incredible loss when his mother and stepfather die because of Young Min. He later ends up in jail where he meets people who will change his life forever. Go Ni learns from a top tazza player in hopes of getting revenge.

This drama is about an insurance investigation team who investigates foul play and insurance cheats. They are a group of normal employees who decide to take a stand, unearthing the truth hidden beneath the lies and discovering the dark secrets of those in power. Everyone has a secret they want to keep under covers forever, and insurance agents and policy holders are no different.

This drama depicts the sacrifices four central characters make for love, vengeance and honor as each travels a road of chosen destiny.