Taken from drama of the same name:

After his mother is brutally murdered in front of him by the Thai criminal syndicate Cheongbang, Lee Soo Hyun is adopted into NIS agent Kang Jung Ho’s family. Together with Kang Min Gi , Jung Ho’s son, Soo Hyun becomes a NIS agent. When Soo Hyun met Suh Ji Woo they were about twelve years old and has another fateful encounter with her 13 years later. Together they had promises for the future.
One day, Soo Hyun leaves for an operation dealing with the Cheongbang, only to return in failure because of the resurfacing terrible childhood memories of when he was in Thailand. The chief of NIS agents, Jeong, proposes to the distraught Soo Hyun to infiltrate the Cheongbang. Through Chief Jeong’s proposition, Soo Hyun becomes an undercover NIS agent after staging his death. Hiding his past, Soo Hyun infiltrates the Cheongbang with revenge in mind, leaving Ji Woo behind. Under the pseudo-name of Kay, he passes through the backstreets of Bangkok. What Soo Hyun didn't know was Ji Woo is the daughter of the same villain, who killed his mother and father.

When Sun-Hyuk Cho became an orphan at a young age he was taken in by his maternal grandfather, an extremly wealthy and notorius businessman. However his grandfather has just died leaving teenage Sun-Hyuk Cho his fortune under the condition he finish his education. In Sun-Hyuk Cho's video journal he reveals the difficulties he's having dealing with this death. He is not helped by the eccentric employees his grandfather has left behind or by his own eccentricities.

The spam-mail boom of the near future: The great advances of technology, a new generation of improved systems, and ideal computer programs have caused a backlash. The IT world has advanced significantly to the point where humanoid "Spam" mails are causing trouble for their humans. In the near future, hundreds of thousands of spammers have caused incalculable destruction to the mainframe of the lives of everyday citizens. Enter "SM" Hunters to save the humans from our own creations. Can "Spam" ever be good?