Seven girls become good friends in high school, then events pull them apart for 25 years. When one of the friends lies dying in a hospital, she wishes to see each of them one last time.

A notorious dirty cop makes an honest attempt to catch a serial killer who even murdered his own parents.

A string of brutal murders targeting pregnant women mirrors the crimes of convicted serial killer Shin Hyun, who remains behind bars. Detectives Kim Mi Yun and Kang Tae Hyun take on the case, suspecting that Shin Hyun may be manipulating the copycat killings from prison.

Choi Ki-dong, who becomes a teacher, and Park Young-jun, who becomes a gang member, meet again after 10 years. To compete for Min Ju-ran, they start a fierce battle remembering their high school days, when the situation was completely different.

On March 26, 1991, five boys set off to the mountain to go frog hunting and never come back to their family. While a documentary producer, detective and professor try to solve the mystery of the incident, one of the boys' parents is a suspect.

Bent on reclaiming a lighter which is his only possession, a broke man pursues the thief, who turns out to be a mob boss planning to hijack a train.

Seo Rin who was recognized for her directing skills abroad, returns to Korea and will be the director of a green drama "Natural Romance". She will also be reuniting with Soo Hyeok who has been with her for a long time, since they were young and on the set. Unlike before, Soo Hyeok is now a top actor. They spent their childhood together, and whenever Seo Rin sees Soo Hyeok who once confessed to her, she feels happy.

The three people, who have difficulty finding their common ground, open their eyes in an unknown space. Who, why, how where they locked up here? They can only escape if they find their lost memory!

Choi Ik-Ho is a martial arts star with talent for action and humor. But one day, he is framed for murder. Ace is a game planner, who makes a game for the Korean upper class. He is a villain who makes a city into a big gameboard through technology. Ace and Choi Ik-Ho become adversaries as Choi Ik-Ho jumps into the game to save his brother.

An up-and-coming lawyer wakes up next to a beautiful woman with mafia connections, but neither remembers how they got there. That's a problem.