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Yun Seong Kim (김윤성 / 月城カイ)A salaryman in his 30s with a wife and a daughter. Kim Yoon Seong was a man with a perfect life: a job, a loving wife, and a daughter. All this changes when one day he turns into a Trace with powerful legs. Being a law-abiding citizen, he decides to legally register as a trace, rather than hide his identity.
Note: Tsukishiro Kai (月城カイ) is the name used in an alternate Japanese version/rewrite.
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