Juvenile Police is a Manga/Manhwa/Manhua in english language, Manhwa 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

In 20XX, due to the increasingly vicious crimes committed by minors, the government establishes a special team called the Juvenile Police, made up of students hired as officers.

The ordinary boy, Do Jae-ha, loses his closest friend, who was also a member of the Juvenile Police, in an accident and chooses to follow the path of the Juvenile Police.