'Typhoon' made a name for fighting in middle school. He decided to forget the past and live a quiet life, but his resolve crumbles when he collides with school officials. Meanwhile, 'Sang-min', who stands at the forefront of the Iljin group and leads it, and 'Ik-jun', a gangster who controls it from behind. The 'Sang-min' gang and gangster senior 'Ik-jun' and gangster extort money by blackmailing male customers who want to use female students to have an aid relationship. 'Typhoon', who does not join the school Iljin, runs into conflicts with the Sangmin and gang, and the two of them are in a situation of improvisation...

While under heavily armed guard, the dangerous convicts aboard a cargo ship unite in a coordinated escape attempt that soon escalates into a bloody, all-out riot. But as the fugitives continue their brutal campaign of terror, they soon discover that not even the most vicious among them is safe from the horror they unknowingly unleashed from the darkness below deck.

Yoo-ra suffers from nightmares every night. One day she meets her high school friends. Jin-tae is a promising artist, In-seok is a chaebol and former thug, Hye-jin likes In-seok, and Seong-ho, who used to be In-seok's errand boy, finally meet up. Yoo-ra asks her friends if they remember the classmate that killed herself. Everyone is flustered and claims they don't. Yoo-ra goes to the bathroom, but passes out after seeing herself in the mirror. Everyone gets in In-seok's car to send Yoo-ra home, but they get into an accident and all become unconscious. When they wake up, they are at a familiar school that's closed. It was the school they went to that has closed down.