When two rival school campuses merge, former best friends Saint and Shin's lingering feud ignites a classroom war, forcing teachers to reconcile the stubborn pair...
Something in the past makes Shin refuse to accept Saint back as his friend. While in school management, Sung joins Jan as a dual homeroom teacher for the most problematic class; Class 2.
Thep Burapha and Udon Phithak get into a big fight. Saint, who has just been elected as class president, must take responsibility for the chaos in order to avoid even bigger chaos between them.
Ken, Knot, and Nate team up with Jeng, the leader of Dragon Fang, to ambush Shin as revenge for the death of his brother, Jom. As they mistake Shin for Tsunami, the real Tsunami comes to the rescue.
Saint the 'Tsunami' managed to save Shin, but Jeng would not stop until he destroyed Shin's life. Chadjen asks Saint to protect him, while Sung threatens Jeng to stop approaching his students.
Things in Siamwit School get worse when rumors that Shin killed someone and was dealing with a mafia gang reached the parents' association, putting him at risk of being expelled from school.
Shin was almost expelled from school if Saint didn't help fix the misunderstanding, but it seemed not enough. Saint has to give up the most important thing in his life to bring Shin back to school.
Saint decided to give up the most important thing for him which is a chance to make up with Shin by quitting school. Jan and Sung plan something to take Saint back to school and to make them reconcile.
