When Siamwit School falls on hard times, the school administrator Paphada decides to merge Udon Phithak campus with the main campus, Thep Burapha. The two campuses have long been at odds with each other, and now they'll be sharing one roof for the next school year.
Saint, the head of class M.5/2, doesn't care about school or anyone in it. In middle school, he headed a gang of bullies. Now, he's met with rebellious, temperamental and stubborn Shin. In the past, Saint and Shin were close friends, but something happened between them that put a violent end to their friendship. The friction between the two causes a classroom war and teachers Jan and Sung have to put their differences aside and come together to put an end to the fighting which will require a reconciliation between Saint and Shin.
Quando a Escola Siamwit passa por tempos difíceis, os administradores da escola Paphada decidem fundir o campus Udon Phithak com o campus Thep Burapha. Os dois campi estão em desacordo há muito tempo e agora compartilharão o mesmo teto durante o próximo ano letivo.
Saint não se importa com a escola nem com ninguém dela. Agora, ele se depara com Shin, temperamental e teimoso. No passado, Saint e Shin eram amigos íntimos, mas algo aconteceu entre eles que pôs fim violento à amizade. O atrito entre os dois causa uma guerra nas salas de aula.
