Jung Hoseok, Yook Sungjae and Cha Hakyeon are fellow Police men on the same Undercover mission : Infiltrate the Big Hit High school to finally arrest one of the biggest Drug ring Leaders around this city. They all have one person which they have to observe to find proofs But not only do they have to observe them – no, they have to gain their trust, to become a part of their lives. Jung Hoseok has to observe th