Kang Cheol-gang goes to Tokyo to get revenge on his father, but gets caught up in a strange incident and his gene is mutated!

A rising boss in the underworld is forced to lead a double life as a police officer and a gang boss in order to find the killer of his brother. ... more>>

Completed printed version

Author remade the series at Lezhin

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Acting tough is the last thing that hell-raising street thugs must worry about when suddenly an orphaned baby lands in their care.