A quiet, professional killer, Hyun-jun, arrives at a house to kill a man in his sleep, only to discover a woman alone under the sheets. Jin-young has decided to kill herself after a traumatic break up with her lover of seven years, but she wants to go out with a bang, not with a miserable and lonely dose of commonplace sleeping pills. The most extraordinary love story begins.

Tae-sik is only just a manager of the top star Won-joon, but he dreams of becoming famous like Won-joon in the future. An unexpected opportunity falls on Tae-sik's lap one day when Won-joon is involved in a hit-and-run accident and Tae-sik takes the blame as the driver instead of Won-joon. In exchange, Won-joon promises Tae-sik his debut as an actor. Tae-sik's acting career kicks off when he gets out of jail, and his success and stardom start to threaten and intimidate Won-joon. Tae-sik finally becomes much more popular than Won-joon, but his pure passion turns into greed and he’s on the road to corruption.

Dong-chul, a thug who cannot fight but acts like a tough guy, meets Han Se-jin, his new neighbor. Dong-chul is intrigued by her spitfire personality, and the bickering duo realize they may be perfect for each other.

Two police stations from neighboring precincts are in constant fierce competition with each other, including for the Officer of the Year award. But then a high-profile case forces them to work together.

A fabled painting from royal palace was discovered after 400 years. Once properly restored, it could fetch at least $40 million in the international auction market. Bae is the owner of the gallery which possesses the painting. She scouts top-tier restoration artist Lee to work on the painting. With Lee's expert stroke, the controversy surrounding the painting is slowly unveiled. As the painting's true form is restored, art experts in Korea hold a collective breath. Little do they know that they're only a part of a bigger scheme.

Hyeon-jeong's sister is missing and she fears for the worst. Via her sister's cellphone, Hyeon-jeong learns that her sister stayed in a countryside vaillage. She goes to the village to find her sister and stops at the local police station for help. Because of the little evidence she has, the police refuse to offer help.