When Siamwit School falls into financial trouble, administrator Paphada merges the rival Udon Phithak and Thep Burapha campuses. Tensions run high—especially in class M.5/2.

Saint, the aloof class leader and former bully, is forced to confront Shin, a fiery rebel and his estranged childhood friend. Their broken bond ignites a classroom feud, and it’s up to teachers Jan and Sung to step in before the conflict spirals out of control.