To prevent the collapse of Siamwit School, both forever-enemies campuses, Thep Burapha and Udon Phithak, were forced to unite. Saint and Shin from the opposite sides must face each other once again.
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.
Saint and Shin have made up, but they must face the exam and the problem underneath. Prang from Udon Phithak is bullied by her fellow Thep Burapha's class 3 as she is caught stealing the exam.
After escaping yet another dangerous encounter, Shin finally starts to see Saint as his friend again. But another misunderstandings again cause friction between their complicated friendship.
The 2nd graders were caught skipping class so they had to receive the punishment of cleaning the whole building after school. Teacher Sung takes this opportunity to help Saint and Shin reconcile.
