育才书院F.4D班学生素来反斗,荒废学业,不少教师也被他们弄走.当中学生一健在校内横行无忌,甚至连主任也不敢招惹他.刚到任张老师却能驯服他们,改善了师生关系,但一场球赛又把一健卷入打斗漩涡,张更为此面临被解雇的命运,究竟F.4D班如何合力解决此事?

育才書院的F4D班的學生是全校最調皮搗蛋的，他們專整老師，考試的時候大部份不及格，已經氣走了好幾位老師。但是新來的張老師卻有所不同，她不但躲過學生的惡作劇，還擺平了同學之間的戀愛問題。 不過張一健這個鬼靈精終於使出怪招，讓張老師吃虧上當，下不了台，張也抓住秦主任的小辮子，使秦主任不敢動他一根汗毛，因此在校內橫行無忌。 張一健突然請了病假，張老師到張家訪問才知健弁未生病，而是因欠了賭債去打工還債，張為了解決健的賭債，找到債主大碌，想以賭來贏錢還債，但她賭輸，大碌反逼張老師替他賣身抵債，張老師憑智慧鬥倒了大碌，她和張一健才得脫身。 自此F4D班很服貼張老師，功課也好了起來，使秦主任大為驚奇。 學校藍球隊隊長吳奇隆因其父反對兒子打球，憤而離出，因此實力大減。 張一健心有失落感，又和大碌來往，並勾結與別人賭球賽，健答應設法使育才書院隊輸球。但在決賽時，隊長吳奇隆報到，隊友士氣大振，健原來預備了瀉藥，一時良心發現沒有放進飲料內，所以育才隊嬴了球。大碌帶人來找健，張老師仗義助拳，把大碌一幫人打跑了。 秦主任事後指責張老師帶頭打架，要解僱她，結果會如何呢？

When a new teacher (Sharla Cheung) arrives, she finds herself caught up in the affairs of the students from her class. Jimmy Lin is harbouring an unrequited crush on childhood friend Athena Chu. However, he is too shy to reveal his feeling to her when he discovers that she has fallen for the cool kid in class, Nicky Wu. Meanwhile, another student Dicky Cheung has gotten himself into trouble with the triads after failing to pay a debt owed to them. With so much going on, how will Sharla Cheung find a way to solve the troubles of her students and get them to study hard to pass their exams?