Kim Yun-Seong was a regular guy living a happy life with his family. That is until he discovers he is a “Trace,” a class of mutant humans with special abilities who emerged to fight the mysterious monsters known as “Troubles,” who threaten Earth. Shunned by ordinary humans, many Traces live in hiding. That’s what Yun-Seong intended to do, but when his family is suddenly taken from him, he is forced to team up with a wild crew of Traces to find them. Little does he know what “troubles” lie ahead.

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.<br>
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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.

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