Mi-ja, who has been taking care of a retired teacher, Ms Park, invites several of her former students to her house 16 years after their graduation. Since the end of her teaching career, Park has been residing in the countryside, suffering from an illness while an ex-student, the kind and pretty Mi-ja cares for her.

A corrupted customs officer, Choi Ik-hyeon, faces losing his job. Then, his life turns around as he meets ganster Choi Hyeong-bae who has connection with the Yakuza. They quickly form a partnetship; Hyeong-bae helps Ik-hyeon set up a business with the money from drug trafficking while Ik-hyeon lobbies for his partner Hyeong-bae. As the government declares war on crime, however, their partnership begins to crack.

An ordinary guy suddenly finds he has superpowers he can use to help his spirited daughter and the people around them, but he also runs into trouble in the process.

One day, his mother who had sacrificed everything to a church to cure his elder brother’s illness, kills herself. His good-for-nothing father has long been out of the picture, evading debtors. Siwan, left alone, goes to a provincial town and finds a young but revered minister of the church who has hidden himself in a small internet cafe. Siwan intends to avenge his mother himself but it’s far from easy.

Park Eun-jin is a loudmouthed thirty-year-old with an abysmal track record in romantic relationships. Freewheeling and adventurous, she is also irresponsible and reckless, pushing away the timid and the cautious, yet always falling for the romantic dreams of the love-conquers-minor-details-like-my-lover’s-married-status variety. After a spectacular break-up with a co-worker, Eun-jin shares a cab ride with Kim Hyeon-seok, a nerdish, awkward young man. Against all odds, they begin a courtship and eventually decide to get married. One night, however, Eun-jin finds a suspicious text message sent to her paramour’s smartphone. Angered, she enlists the help of her female cop friend So-young and her doofus ex-marine brother Eun-gyul to get to the bottom of what she suspects is Hyeon-seok’s two-timing affair. What she finds out, however, is something else altogether.

Kyung-chul is a dangerous psychopath who kills for pleasure. He has committed infernal serial murders in diabolic ways that one cannot even imagine and his victims range from young women to even children. The police have chased him for a long time, but were unable to catch him. One day, Joo-yeon, daughter of a retired police chief becomes his prey and is found dead in a horrific state. Her fiance Soo-hyun, a top secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take bloody vengeance against the killer, even if it means that he must become a monster himself to get this monstrous and inhumane killer.