Jjang-gu joins "Monster," a violent organization at his high school. As a rite of passage, he learns a lesson about being a man while following the course.
as Jjang-gu
as Joo-hee
as Heo
as Kim Young-ju
as Kang Suk-chan
as Moon Hak-jong
as Ddeuk
as Doctor
as Young-bae's Father
