Seong-soo, a successful businessman who lives with the perfect family in a luxury apartment, has secrets and mysophobia about his one and only brother. One day, he goes to see his brother after a phone call about him missing and sees weird symbols all over the house and he meets Joo-hee who knows his brother. "Please tell him to stop looking at my daughter. Joo-hee lives alone with her daughter but lives in fear of someone watching them. Seong-soo looks around carefully at the old apartment and realizes the symbols mean gender and numbers of people.Seong-soo returns to his from his brother's and notices a familiar symbol written next to the bell of his house too. Written by anonymous

Since his wife has been murdered, Dong-ho has lost the light in his life. The successful businessman is broken and falls into depression, though he tries to continue with his life. But as long the killer is still out there, Dong-ho can't come clean with his loss. Then one day he gets a call and can't believe his eyes: he is talking to his dead wife! First he believes this must be a bad joke, but the woman knows things only his wife can know. Dong-ho can't believe his luck, because now he has the chance to safe her life, but he has to be as quick as possible. He thinks a magnetic field anomaly allows him to talk to his wife. Which means that he has to identify the killer and warn his wife before the anomaly disappears again. Written by Anonymus

A group of spies, the 5446 Corps were trained by North Korean special forces since their youth, with a goal of unifying Korea. They are ambitiously dispatched to South Korea, where each disguises himself as a fool, an aspiring singer, and a high school student. Passing boring time without receiving any orders from the North, they gradually get used to life as ordinary neighbors in a small town. Due to the events of the Second Battle of Yeonpyeong, South Korea demands the names, location, and rank of 30 North Korean spies active in South Korea, promising financial aid to the North on the condition that Pyongyang turns in their spies. To prevent the elites from falling into enemy hands, the North Korean government orders dozens of active duty spies to take their own lives. Meanwhile, their North Korean army instructor Kim Tae-won crosses the border to eliminate those who refuse to comply.

Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.