Juvenile Offender is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Lee Yong-ga South Korea is filled with various shitty laws. The group of ‘juvenile kids’ that made my life into a living hell didn’t receive any punishment: these kids were the result of these shitty laws. I’ll now start my revenge.