Jay, a promising young writer, is about to publish her new book. Geonwoo, Jay′s roommate and lover, works as an English instructor at a private institute and silently assists Jay. Both of them care about each other and are happy as they are. However, Jay’s unplanned pregnancy brings huge changes, causing conflicts between the two.
After a high-ranking North Korean official requests asylum, KCIA Foreign Unit chief Park Pyong-ho and Domestic Unit chief Kim Jung-do are tasked with uncovering a North Korean spy, known as Donglim, who is deeply embedded within their agency. When the spy begins leaking top secret intel that could jeopardize national security, the two units are each assigned to investigate each other.
Haeyoung is a hopeless girl. She lives with her father who runs a Chinese restaurant, and a younger sibling. One day, her father has a mysterious accident, which places her in a position of responsibility. She is now not only the head of the house and must look after her younger sibling, but also an investigator tasked with finding the truth about the accident, and a fighter standing against the ugly world.
Jin-soo is satisfied with life and tries to make the best of things. When his father disapproves of the girl he likes, he is determined not to give up. However, his resolve is tested with the death of a former classmate and news that his love interest is planning to leave Korea.
High school student Min-sik moves to a rural village with his family. There he meets Ye-joo, a classmate who became a social outcast after her father was accused of murder.
Eun-a, who was living a happy life with her family, loses everything to a psychopath serial killer. After the tragic incident, she gathers four people with different talents who are in need of organ transplants to achieve her revenge.
