Five brilliant students have just graduated from the academy and start working in 15 police Division. Rookie cops do not realize that training has nothing to do with real life! Still there are too many things to learn. Due to inexperience, the young officers many foolish mistakes what causes social condemnation and draws disfavor from police authorities. The lead characters are always under strong pressing as more experienced colleagues profusely jeer at them. In the 6th season rookie cops feel much confident about their proficiency until they deal with really unnatural crimes, which are too difficult to be solved.