Set 3 years after the first season, members of the National Security Service (NSS) team, including Jung Yoo Gun, Ji Soo Yeon and other agents attempt to pull the curtain on mysterious group IRIS. Agent Yoo Gun is the leader of the NSS TF-A team. While he goes up against Baek San, Yoo Gun becomes involved in a case which changes his fate forever.

Some may dream of, some may be afraid of, some may look forward to, and some may want to avoid THE NIGHT BEFORE MARRIAGE! 4 different couples disclose 4 different stories all about marriage.

After the Japanese kidnap two Korean teenagers and take them to a comfort station to join other girls who are serving as sex slaves, only one of them survives. Decades later, the elderly woman tries to reunite with her friend's spirit.

After a traumatic event, a drug trafficker turns sides and conspires with a dangerously ambitious undercover police officer to bring down the mysterious kingpin of a major drug cartel.

Jang-soo is a judo instructor who is indifferent to everyone but his daughter. One day he realizes he can see Tae-jin, a ghost who used to be a devoted police officer. Tae-jin asks Jang-soo to help solve the case that took his life away from him.

A professional GO player gathers a team to help him carry out his revenge against the man who killed his brother.

A reverse comedy that tells the story of a perfectionist assassin who falls and hits his head in a sauna, giving him amnesia. When a down-and-out actor switches locker keys with him, they switch lives until the hit-man, who soon becomes an action hero on TV, starts to remember things.

Yeong-gil is in graduate class and is stressed about getting a job. To make things worse, he's not had any experience with women yet, so he's always searching for something in his dreams but wakes up to nothing. Then one day, there is a change in his life, he puts his hand in The Box of Pandora and gets a job although it wasn't a regular position. He sleeps with his female superior during the interview even though it's not how he imagined it. Then one day, he visits Joo-yeon's home and meets her beautiful mother. Can he keep himself from being seduced by this woman?