A former serial killer Byung-su gets diagnosed with Alzheimer’s and when a series of murders occur near his town, he worries whether the killings are his doings. Then, he comes across Tae-ju and realizes that he’s the killer. He reports this to the police, only to learn that Tae-ju is one. Byung-su tries to find evidence against Tae-ju, only to raise the young killer’s interest on him and his dear daughter.

HA Yoon-ju becomes the newest member to a unit within the Korean Police Forces Special Crime Department that specializes in surveillance activities on high profile criminals. She teams up with HWANG Sang-Jun, the veteran leader of the unit, and tries to track down James who is the cold-hearted leader of an armed criminal organization.

Chul-soo is one of Korea’s best intelligence agents: he can accomplish any given mission. One day, a mysterious explosion takes place in Seoul. Chul-soo flies to Thailand on a mission to rescue a person who holds clues to the incident. Meanwhile, Young-hee goes on a business trip to Thailand and gets entangled with Chul-soo’s mission. Will he accomplish his mission and save his wife at the same time?

On Christmas Eve at Tower Sky, an ultra-luxurious building complex, a White Christmas party is held to dazzle its equally high-end tenants and VIP guests. Dae-ho, the manager of the building and single father, is forced to cancel plans with his daughter Hana to work the event. His Christmas is saved when Yoon-hee, the food mall manager with a secret crush on Dae-ho, offers to babysit Hana during the party. Meanwhile, Young-ki the legendary fire chief of Yoido Station has finally promised his first holiday date night to his long suffering wife. The party is in full swing with the spectacular sight of two helicopters flying overhead just to spray snow on the partygoers and make everything perfect. When unthinkable disaster strikes, Dae-ho and Young-ki must summon all their strength and courage to save the lives of thousands but at what cost to themselves and their loved ones?

Man-sik and Yeon-hee, are unsure as to whether they can overcome past wounds and continue being a couple. Dr. Kim, who cautions against a possible mega-tsunami at Haeundae, collapses in agony springing from an unexpected turn-up of his daughter and divorced wife. Hyoung-sik, after rescuing a woman from Seoul, rides out a ferocious storm to gladden her heart. A tsunami which destroys Haeundae symbolizes the establishment of a typical axis called provocation of conflicts, and later the inner spaces of the couples without anything left behind after all conflicts have ended

Dae-ho, an investigative journalist, seeks to track down the whereabouts of his son who was abducted three years ago. With the help of a detective and a psychiatrist friend, he will retrace his memory of the incident through the use of lucid dreaming techniques.