The story set in the contemporary South Korea. Some 30 years ago, unidentified creatures appeared out of nowhere and have attacked people. They have caused massive destruction wherever they go. The monsters are called "Trouble", and get the world have fallen into chaos. Along with the first appearance of the "Troubles", some number of humans were born with or acquired supernatural abilities. These mutants called "Trace" are the only ones who can fight off the "Trouble". The "Trace" are also considered freaks and generally shunned by the community because some of them misused the powers for their own interest. The plot revolves around two main characters. Sa Kang-Gwon, a high school student born as a "Trace" who attempts to hide his ability. The other is Kim Yun-Seong, who acquired his "Trace" abilities during his early 30s. Soon after the acquisition, his wife and daughter were taken away from him for experimental purposes.

From spottoon: A group of crude and vicious criminals get released from prison and get hired at a company through a special reformation initiative. They must adjust to the horrors of office life because if any of them get fired, they?ll all be executed. [Original Webtoon](https://comic.naver.com/webtoon/list.nhn?titleId=144956)

Lin Shuwei, a quiet and deligent student was being bullied by his classmates. He was falsely accused of being the culprit who stole the class lunch money. As punishment, his teacher assigns him and the three main bullies to volunteer at an old age home. There, they encounter two human-eating monsters. They managed to capture one of the monsters and repeatedly conduct their own experiments on it in a secret basement. As event unfold, the true horror begins to reveal itself.

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