Rehabilitation Classroom 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.nl fastest updating comic site. The Summary is

In a South Korea where the Juvenile Act has been abolished and a “Rehabilitation Center” has been established to reform juvenile criminals, Minsoo is sent there under the false accusation of murder. However, he soon discovers that the rehabilitation center is a living hell from which escape through normal means is impossible. Minsoo’s older brother, Yoosung, infiltrates the center as a guard to save his brother in peril. A desperate struggle for survival and escape unfolds as the two brothers fight against false justice!