拾圓集團發出「死亡名單」，余暉連同其他五名員工HR張 、阿久、真真、Even和安哥需要接受為期五個月的再培訓計劃，不達標者會立即被辭退。接受再培訓的地點，竟是一所不折不扣的小學 —— 勤識小學！六名「真．小四生」波子、美悠、小宇、大家姐、許越和Elly，加上六名超齡小學生，湊成了「四年S班」，由年輕貌美卻不苟言笑的Miss伊擔任班主任，在胡鬧與笑聲中互相砥礪和支持，展開人生的一次補課，重新認識自己。因為有波子作伴，余暉逐漸喜歡上小學生活，同學之間也建立出深厚的友情。然而當學期接近尾聲，余暉卻因犯下校規被迫退學，再培訓計劃亦隨之被勒令終止。原來計劃背後，是勤識小學校長蔡小棋和拾圓集團老闆葉一禾的一場打賭⋯
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