Kang San-Hyeok is a member of the 119 special rescue team. He is handsome and smart, but he does not remember his childhood. Jung Young-Jae is an enthusiastic surgical resident.
Kang San-Hyeok and Jung Young-Jae meet at a mysterious forest. Even though they do not want to, they must live together in the mysterious forest. Living there, they discover small pleasures. Kang San-Hyeok and Jung Young-Jae soon uncover a secret about themselves and the forest.
Hae-Jin is 36-years-old. She is married to Jin-Sang, who is 6 years younger than her, and they have a daughter Yoo-Ri. Hae-Jin runs a restaurant that she took over from her father-in-law. She supported her husband Jin-Sang while he studied to enter a university. Because of Hae-Jin, Jin-Sang is now attending a prestigious university, but he has an affair with Joo-Ri. She is the young daughter of a rich family. Hae-Jin becomes aware of her husband's affair, but she doesn't want a divorce. Meanwhile, Dae-Gu appears in front Hae-Jin. Dae-Gu is a drama series writer. He was once in demand for his screenwriting, but his popularity has waned. His marriage life is not doing well either.
Oh Hyun-Jae used to be a top criminal profiler. He solved many cases with his skills, but an explosion, caused by a serial killer, ended the life of his fiancé. After the horrific incident, Oh Hyun-Jae vanished and he now lives in seclusion. Meanwhile, Cha Soo-Young is police officer in a rural area. She has a special ability, which allows her to remember everything that she saw. Due to her special ability, she is selected as a rookie detective who will partner with Oh Hyun-Jae informally.
Carrie Jung lost her husband and child. She now lives only take revenge on those responsible for their deaths. Carrie Jung raises Han Yoo Jin as a tool in her revenge plan. Han Yoo Jin is a smart and beautiful woman, but she falls in love with a man who she should not love.
Cha Young Jin is a detective. She lost her friend 19 years ago to a serial killer. Cha Young Jin still carries guilt and trauma over the death of her friend. The serial killer case then begins again after 19 years. Cha Young Jin chases after the killer.
Boo Yong Joo was once a famous surgeon at the peak of his career at a major hospital. But he suddenly gives it all up one day to live in seclusion and work as a neighborhood doctor in a small town. He now goes by “Teacher Kim” and refers to himself as the “Romantic Doctor.”
Swifty the Arctic Fox works in the mailroom of the Arctic Blast Delivery Service but dreams of one day becoming a Top Dog. To prove himself worthy of the Top Dog role, Swifty secretly commandeers one of the sleds and delivers a mysterious package to a secret location. He stumbles upon a hidden fortress, where he comes face to face with Otto Von Walrus, who plans to melt the Arctic. Swifty must enlist the help of his friends to put an end to this evil plan and save the day.
In the 1990s, when Go gambling fever swept Korea, Gui-su loses everything because his father gambled obsessively until there was nothing left. Left all alone in the world, Gui-su meets a mentor and Go teacher, Il-do, and goes through vicious training to become the grandmaster of Go. He sets out for revenge on the world that destroyed his life, but soon finds himself chased by an unknown loner pursuing his own vendetta.
A drug squad attempts to take down a criminal organization and they must go undercover to do so, so they begin working at a chicken restaurant, that becomes famous for its delicious chicken. Due to the unexpected popularity, the detectives find themselves in a situation they never expected.
Two rival detectives with different methods try to solve the murder of a missing girl after discovering her mutilated body in the tidelands of Incheon.